The main problem is that some people think that troll levels, automatic levels, and musical levels are fun, their stars rate skyrockets and more traditional levels never gets the exposure it needs. The perfect solution for me would be that the creator must include a category (or tag) along with the name when they upload them and you can search IN THE GAME (not only in the website) levels with those tags only. Also, the "Explore Levels" section need to sort by tag so we don't have to browse 30 "Don't move!!" or "Zelda theme!" levels before I find one interesting level to play (and find out it's a troll level).
Oh nice. I bet with slopes and newer elements, some Nintendo made levels would be even better.
Definitely won't happen. Mario Maker is too limited to make anything that could be considered a full blown 2D Mario and they wouldn't waste their top effort on levels for Mario Maker when they could make an actual 2D Mario and sell that separately.
Temper your expectations. The 3DS port of the first game needed a feature like that since the 3DS version had severe limitations to its online features compared to the Wii U version. The 3DS version didn't allow you to share level you created online, making the level creation aspect of the game essentially pointless; and you also couldn't play any level that featured the mystery mushroom and you can only play recommended courses rather than search by ID or creator. And even then the Nintendo levels in the 3DS version were still not that good. They were more like examples of ideas and mostly borrowed concepts that were done much better in player-created levels from the Wii U version.
