Monster Hunter classically is a more Japan centric title, but yes, this would also bolster this lineup. I also heard stuff about a 2D-metroid, possibly a remaster of Samus Returns. Possibly a rumour, but again, if true something more to look forward to. Nothing of this is big as Smash, but all together might be enough.

2D metroid at 60 price is too niche for being a major seller, but I'm definitely looking forward it regardless 

As for Monster Hunter, World skyrocket its popularity in west I'm sure a brand new Monster Hunter with proper AAA production value and a massive marketing campaign from Nintendo will have stellar sales both domestically and internationally and might as well be the best selling 3rd party game on Switch by far

It makes zero sense to exclude major third party titles when those are the driving force for other platforms. But especially in this case, as Nintendo is actually publishing Bravely Default II. If we also include other major third party exclusives, No More Heroes 3 is still slated for this year. And Mario Kart Live features complete software in addition to the toy. There's no reason to arbitrarily decide which games should count as their lineup based on your personal preferences. I personally don't care about Bravely or Mario Kart Live but to say they just don't count for absolutely no reason is being completely unfair. Even more so seeing as you would think a new Metroid or F-Zero to count when those would be MUCH smaller releases sales wise for Nintendo compared to Hyrule Warriors or Mario 3D All Stars. Maybe even smaller than Bravely Default, which did really well on 3DS, and better than the Metroid games released on that platform.

Still the weakest late fall/holiday first-party line-up of the Switch so far. And considering it's already September, we're likely to not get another first-party port or new game surprise for December or any of the rest of the year. Bravely Default 2 is still unknown besides a 2020 release date. There's honestly a good chance that game gets delayed until the first half of 2021.
From a revenue standpoint, there's plenty for Nintendo to bank on in the fall and leading up to the holidays.

3D All Stars will carry the holiday easily

First off I'd say it never looked like Nintendo was forgetting the holidays. That's just the absurd conclusion some people came to just because we didn't know what was coming out during the holidays yet.

I think there will no doubt be at least one more holiday announcement in the coming weeks. With BotW2 clearly hitting next year after the Hyrule Warriors announcement, I'm not expecting a really major holiday title, but rather just at least one more solid first party game to be added to that lineup.

So far we have:
1. Mario 3D All-Stars which will should easily sell 10+ million games in its 6 month run, and very likely just by the end of the year.
2. Mario Kart Live which is more a kids/niche title but is a cool piece of tech
3. Pikmin 3 Deluxe which will be a smaller selling game but still a solid release added to the Fall schedule
4. Hyrule Warriors which quite frankly looks awesome and I think it'll blow out the sales of the first game. Still not a mega seller but wouldn't be surprised to see a 3-4 million sales this holiday season alone.
And I'm pretty sure we'll have at least one more announcement of another moderately big game.

With the much more solid 3rd party support Switch is getting these days, plus Mario All-Stars as a major holiday seller, plus these other moderately popular games, plus probably more games to announce, and of course AC and RFA (perhaps more so in Japan) will continue driving Switch sales, I think its not a bad holiday at all. Will be interesting to see what else Nintendo announces for the holidays.

Personally I'll for sure be picking up Mario 3D All-Stars this holiday. And I might eventually pick up Pikmin and Hyrule Warriors, probably waiting for a sale down the road.

Nintendo's 2021 and 2022 Holidays are looking even worse, ZERO games from first AND third parties. Nintendo is doomed!

Not a great lineup. Remakes are ok but don't get me too excited. Mario Kart Live is fine for its audience but it's not for people my age, especially living in a small apartment. Bravely Default II hasn't been given a date yet. Hopefully it will release this year as planned. If it doesn't then, basically just Hyrule Warriors.

But, it's been a tough year all around, so no use getting all upset about it.

For the year we had, it is a pretty good lineup. I'm sure Animal crossing will still be heavy enough to give some weight to this come the holidays.

Well if we're talking about sales, I don't see this holiday lineup outselling 2018's. Smash + Poke'mon Let's Go is just too much. For both years overall though? Animal Crossing is an absolute sales monster at 25-35 million in its first year, so it's possible. Unlikely but possible. I'd give it 15% odds that AC carries 2020 to better overall software sales than 2018.

Xbox usually looks bad, but Playstation? On an overall yearly 1st and 2nd party output basis they are just as good as Nintendo, if not better. But anyway, even if we were to accept Bravely Default II, we'd have to accept Valkyria 4 in the 2018 comparison. Did Valkyria 4 sell well? No, but it was a fantastic game.

Yeah, I didn't mean to imply that you thought 2020 was better than 2018. The 2018 vs 2020 comparison wasn't trying to imply that the OP thought that. I very nearly quoted you on the Smash + Pokemon missing comment. I was going to say that you hit the nail on the head with that comment. Couldn't agree more, that Nintendo is missing at least one big Holidays seller, compared to other years. Animal Crossing's insane leg's not withstanding.

I see your point about things counting or not counting.

I want you to imagine Nintendo's 2018 only worse. In this alternate timeline Smash Ultimate doesn't exist. Octopath Traveler got delayed to December 2018. Labo is now a holidays title. Bayonetta 2, also got moved to the Holidays release window. Tropical Freeze is now an early 2019 release. Valkyria 4 doesn't exist. Neither does Super Mario Party. Poke'mon Let's Go is still there of course. I think we can both agree that such a scenario would be worse than what Nintendo actually had in 2018.

This alternate scenario lines roughly lines up with what we know Nintendo has so far for holidays 2020.

Bravely Default II = Octopath
Labo = Mario Kart RC Cars
Poke'mon Let's Go = 3D All Stars*
Bayonetta 2 = Pikmin 3
Torna = Age of Calamity

*Okay, 3D All Stars and Let's Go aren't exactly a 1 to 1 comparison. Let's Go is a remake with enough twists to make it its own game, while 3D All Stars is a very low effort compilation. But I think 3D All Stars will sell roughly 8 to 15 million units, so saleswise, I think it fits.

On a personal level, I'm very disappointed in Nintendo's holiday schedule, because the only thing new I'll be picking up is Age of Calamity. But on an objective level, I think we can agree that Nintendo's 2020 Holiday release schedule looks a lot like the alternate 2018 Holiday release schedule that I layed out above. 

P.S. I would love for NMH3 this year! Sadly I've lost hope in that. Bravely Default II might even get delayed. :(