You can't play Sunshine with the Wiimotes and you can't play Galaxy with the Gamepad because they're heavily linked to their original controllers (which are mostly designed based how you play the 3D Mario game of the console).

And btw Super Mario 64 DS is a remake of SM64 with more playable characters, not a port.

That doesn't say I don't want nor expect a port, I just say I wouldn't be surprised if it wasn't coming.

It's very different of 2D Mario games. We had a 2D Mario game collection during the SNES era, that's says a lot. 

Fingers crossed for Xenoblade x, Pikmin 3, Tokyo mirage sessions and wonderful 101

This is the last time I'm going to post here because you are ignoring what I'm saying in favour of sticking with your own opinion. Your position seems to simply be that because you want Chronicles X on Switch, you think it's going to happen this year.

To summarise my position - which I think is much stronger than yours given it's backed up by clear evidence - I don't think it's going to be ported in 2019 because of the scale of making that happen. It isn't simply that you get the game up and running on new hardware, you also have to optimise it for Switch and do so for both portable and tv modes - and we are in this case talking about the second most ambitious Wii U game Nintendo have published after Breath of the Wild. We have the head of the development team and studio responsible for the game saying it isn't happening and that it's very difficult to make happen - especially because of the expense of making it happen (Takahashi cites the cost of porting as a major reason why it isn't happening in the USGamer interview). We know that Monolith Soft are already working on one or two new games and that they usually provide support for EPD developed games, suggesting that they don't have many resources to spare.

To counter your suggestion it could be outsourced to a third-party: we know that Nintendo has primarily had Wii U ports to Switch be handled by the original developer - this was the case with Bayonetta 1/2, Mario Kart 8 DX, Pokken Tournament DX, Hyrule Warriors, DK Tropical Freeze, NSMBU DX - Captain Toad is the only exception, but even then EPD were involved (they had assistance from NST). It's quite clear that Nintendo's preference for Wii U to Switch ports is for the original development studio to handle the porting process. Not a single one of these projects were handed to a third-party studio - apart from Bayonetta 1/2 which was Platinum-developed in the first place. Captain Toad received porting support from another first-party studio (who have only been trusted with minor projects in the last decade). There is not a single shred of evidence to suggest Xenoblade Chronicles X is coming this year beyond the possibility of Wii U ports - and every bit of information we do have about porting games to Wii U - including as I've said evidenced from the head of the developer itself - points strongly to a Chronicles X port not even being underway. If you don't want to accept that, then fine. But prepare to be disappointed when it doesn't come to Switch in 2019.

Personally I hope a port does arrive at some point during Switch's lifespan - but it's pretty clear it's not on the agenda in the near-term.

On the Wii you just connect a GameCube controller (first or third party), problem solved.

And since the controller layout of the GameCube is very similar to any other modern controller (Xbox controllers, DualShocks 1 - 4, Wii U tablet controller, Wii U Pro controller, Switch Pro controller, Switch Joycons...), I'm sure Nintendo would figure it out to make Super Mario Sunshine HD compatible to the different Switch controllers. If users of emulators can do it, Nintendo can do it, too. 

The Super Mario Galaxy games already officially support normal game controllers on the Nvidia Shield console... so there would also be no problem for Nintendo to port them on newer Nintendo systems like the Switch. Additional the JoyCons have motion controls, so a Switch version could offer both input methods.

The "heavily link" between 3D Mario games and their original hardware and controllers are much less important than you suggest.

It's not about resolving any issue, connecting a Gamecube controller implies that you have to buy one in the first place cause BC isn't complete (that's what I did for eg). And it doesn't work if you have a Wii post 2010 or a Wii Mini (which both lack of gamecube controller ports).

You must know it's only the chinese Shield can play Galaxy. You can also add that SM64 was released on the iQue Player then.

Your point is almost entirely based on exceptions ("if you have the right console bought at the right moment in the right place with the good controllers, you may able to play the game"). That's a whole different situation from a port of SM3DW on the Switch.

They even removed 3D World stages from Captain Toad to replace them by Odyssey stages, that's says a lot.

Sorry, what? I proved above that every 3D mario game can be played at least on one different system than the original system (plus PC emulation with a bunch of different controllers), so there is no reason that a proper port of any of these games to Switch should be impossible or improbable.

The basic Switch has all the controls it needs to play any of these games properly: two analog sticks, four shoulder buttons, a lot of front buttons, motion control and even a touchscreen. The only issue for Super Mario Sunshine HD could be the lack of analog triggers, but they could easily fix that: button R for the light squirt and button ZR for the full squirt 

The exceptions aren't the games but the way you can play those games.

You can't just say "you can play Sunshine on your Wii" period. They need the good Wii with the original Sunshine GC disc with a GC controller. Same with Galaxy. "It's available on the Shield" is a false statement. "It's available on the Shield but only in China and with no english or other translation available". Or "You can play it on the Wii U, BUT you have to but a Wii remote + its nunchuck". They aren't the regular way to play Sunshine or Galaxy (aka the most simple and easiest way to play it). The regular way is to buy a Gamecub or a Wii. 

That's way different than a straight port of 3D World which would be on a cartridge ready to play with the joycons or the pro controller. And a straight port of a 3D Mario game on a new system never happened yet. That's why I doubt it will ever get a port.

Pikmin 3 or a Zelda HD remake would both make plenty of sense. Pikmin 4 is supposedly in the works, so assuming it comes out 2020 or later, Pikmin 3 this year would be a good fit. Same applies to Zelda, since we are currently in a gap of Zelda releases.

Still want Tokyo Mirage Sessions, Devil’s Third, Pikmin 3, The Wonderful 101 and Star Fox Zero