To get me to be interested in kingdom hearts after 14 years again.
1) Stamp it full with classic worlds up to 30 worlds so there is for 100's of hours of content going on if you really cared for it.
2) Lots of classics like merlin and not the newer disney worlds only, which i couldn't care about. Obviously they can be in it.
3) Make worlds optional, you choose which world you want to visit and not be forced to sit through worlds you couldn't care about
4) Make it divinity type of combat and remove the hack and slash type of combat out of it
5) Remove the story, make mini story's in the worlds itself that are disconnected entirely.
6) Have some small mmo type of world in it which could be interesting as one world just for 10 levels or something to do some simple raiding like the first human area of world of warcraft nothing more as example, and maybe a rts world.
6) Co-op walking through all the worlds with a friend that doesn't need to buy the copy himself but can be shared
7) 30 bucks at max, couldn't care for more then that, including all dlc's and everything else with it
8) PC on steam, with workshop and modding.
Sadly its most likely going to be more of the same, with a new layer of paint, with worlds i couldn't care about like they demonstrated most of it. And a story that honestly puts you off even if you cared for it.
Maybe i just outgrow kingdom hearts entirely, it has been to long.