Same. My wife isn't much of a gamer but NSMB Wii and NSMBU are some of the only games we'll play together and really enjoy. I think I'd actually pay for subscription DLC for a NSMB-style game if it gave you a few new levels to play through every month or two.
I hoped Mario Maker 2's user-generated content would feel like that, but the levels were so small and puzzle-focused that it really didn't work.
I'd be up for it. Haven't worked on games for a while, but I'd like to get back to it.