I'd be happy for a mere port at this point. There are so many cool Mario Maker levels out there that really should be made available to Switch owners. Why Nintendo didn't release a Switch version right after launch is beyond me.
A sequel with an added 3D World mode would be pretty cool.
I really want an added 3D World mode.
And better yet, even though it'd take up a lot of memory, the ability to make your own world maps to put your levels into! :D