It's interesting seeing how radically redesigned Wendy (I assume) is in that Gravity Falls one. And how they did wind up using some of those gags/monsters in the main show.
The Disney Channel Variety show was awesome. Really surprised Disney hasn't tried to make more House of Mouse-esque shows to keep their older IP relevant.
I've got two theories for why that didn't go anywhere:
1. It'd monopolize IP they wanted to use elsewhere (Chip and Dale, Stitch) and execs or creatives didn't think of just using different characters.
2. Some of the changes/gags felt a little out there/too removed. Like shouldn't Tigger be plush inside?
Though the idea itself, and a lot of the comic timing in that pilot, are great. Hopefully someone would get to try again with the concept.