I've played well over 10,000 courses and streamed maker exclusively for about 2 years. To echo Cyan's point I've only come across a handful of complete "games" inside maker and none of them were anywhere near as polished as Wombat's. Honestly I don't really think there'd be a huge list of level packs being added now as maker seems to be dying in my opinion. Regardless if that's true or not, if the primary concern is just about keeping the market from over saturation then some form of very strict quality control or submission requirements would be necessary.

As far as strats go there are a plethora of them and we've only just begun. The current ones we have take the game from a casual 4-5 hour play through down to just shy of 1 hour and 30 minutes. I also believe the demand is there seeing as how the game already has 10+ runners. During a race the stream hosting it had around 150 viewers which is a considerable amount for a channel that has a normal viewership of 10-20.

At the end of the day I can honestly say that Wombat's level pack is truly an amazing and unique gaming experience that really brings out the best in everything Mario Maker can and should be. The fact that maker is populated with 95% uninspiring and flat out garbage stages is all the more reason why things of this nature should be highlighted and welcomed into the community with open arms.