@Bold It really isn't ... (People need to stop pushing hope into things without without more information.) 

Going by this translated transcript according to Yuji Horii the 'use of hardware is different for each system' and that 'each one (platform) will have a different look to it' ... 

I don't know if the Switch version will be a downgraded PS4 version graphics wise when we consider these facts. The first being the Switch struggling with the much less complex Dragon Quest Heroes 2 as pointed out by digital foundry. (I'm not sure if 'unoptimized' is a good excuse anymore when the vast majority of japanese titles are not technical masterpieces like we see with DQ11 being 900p@30fps on the PS4 since it's 3x harder to run DQ11 than it is to run DQH2 which was 1080p@60fps on PS4.) The second fact being is that UE4 has a graphics vendor bias (prefers Nvidia chipsets over AMD chipsets) so DQ11 on the Switch might very well come closer to the PS4 version if we take a look at Snake Pass which runs like crap on consoles but the Switch holding up very well ... (The game also has to be built around the portable mode as the baseline for the Switch, not the docked mode.)

Yokai Watch 3 did over a million comfortably but there's more to cost than just graphics. I'd say asset generation is the most capitally intensive aspect about game development when you take a look at MMO's which cost the most by far to produce but the graphics on those games are subpar ... (I'd argue asset generation to be more correlated to cost of game development than graphics.) I guess Nintendo could just pick up the bill for Level-5 to produce Yokai Watch much like how Sony funded their earlier games if Level-5 isn't willing when it comes to it ...

I still think it's too early for a Smash Bros game to come ... (2019 sounds more realistic when 3 out of the 4 games released >5 years in between each other.)

Pokémon > Smash Bros > Animal Crossing.
(This is assuming that we'll get a new mainline title of each next year, which is not very likely.)

Monster Hunter World Ultimate would be a big system seller in Japan, but I doubt it will ever be released. Dragon Quest and Yokai Watch will be minor system sellers in Japan.

New IPs and Metroid won't be big system sellers, since people who'll buy them will mostly be people who already own a Switch.

Metroid - Animal Crossing!

Actually, it can. A ton of Splatoon 2's development most likely didn't even take a year, due to the base game already being there.  A ton of assests were re-used and so on and so forth. I'm confident they have had a small team making an HD Animal Crossing for quite some time now, and now that Splatoon 2 is out and was done probably mid-June, they're most likely well underway with AC. Plus, they're already used to HD development and the Switch, so unless they're making Animal Crossing open world, it is definitely entirely possible for it to be out next year.

I assume the killer app will be Pokemon Switch, unless that is not going to be a 2018 release. However, I think that they're going to want to release it by then.

I doubt that Pokémon is getting a 2018 release. Sun and Moon came out in 2016, and the shortest gap between new Pokémon generations is three years.

Red/Green: 1996
Gold/Silver: 1999
Ruby/Sapphire: 2002
Diamond/Pearl: 2006
Black/White: 2010
X/Y: 2013
Sun/Moon: 2016

On top of that, Pokémon on Switch is going to be Game Freak's most resource-intensive project yet, since now they have to make a game that's relatively console-scale. 2019 is probably the best we can hope for.

Monster Hunter World Ultimate?

Well, I'd asssume that they would have been working on it for quite a while, or at least that Nintendo would have been helping them wih their manpower and resources in order to have a smoother development.

Pokemon if it's ready or Animal Crossing most likely (though AC doesn't have the same sway outside of Japan).

I think the Fire Emblem series will be getting a make over on the Switch to be made into more of a AAA killer app budget wise and with more 3D graphics and new game play too.

I think you will see Luigi's Mansion 3 as well. LM2 sold 5 million copies ... there's no way Nintendo just forgot that, they've been saving it strategically. 

Luigi's Mansion for switch by Retrostudios