I'm afraid I'll spend all of my time working on elements like this, but never publishing them. Here we are dreaming of all the cool concepts and when th game hits it's going to be a bunch of troll levels and don't move levels and music generators.
I know one reason I hesitated to publish levels was that I would finish them, be really proud of them, publish them, only for them to not get any plays and then Nintendo would delete it from the server and make it so I couldn't upload it again. I hated that. Made me not want to upload new levels for fear that they might just get deleted from the server before anyone played them. Once I rebuilt the level from scratch so I could reupload it, and the second time it got a lot more plays, so I know sometimes it's just luck of the draw.
I'm hopeful that with the new tagging system, the ability to downvote, and other little quality of life social features like that, maybe all the junk levels will sink to the bottom and I can be more sure that if I work hard at a level it'll be likely to be seen and played by at least a few people before it sinks into irrelevancy again. Don't move levels and music generators will always be successful, but they'll also have their own tag so you can filter for or against them when you feel like playing them or want to avoid them. Troll levels will get massive boos, and people who want to play them will hopefully be able to sort by most booed with a relevant tag and be able to find them, while the boos prevent most people from having to deal with them.