I want this back so bad for Kingdom Hearts 3. Especially increasing playability, it would be fun again to play with friends. Most importantly, a endless wave mode with friends. This would definitely be awesome. Thanks for reading.
Out of all the things that could return from previous games, this is what I could see returning the most. Especially if there are online mini-game stuff. But at the same time, I more expect that they'd just do their own new thing... However, KH3 is pretty much a bunch of ideas from past games lumped together... So who knows?