I honestly think the next KINGDOM HEARTS game will be a full console experience like KHII, but it'll be more of a bridge game than a full experience like KH3. I'm getting Dream. Drop. Distance. vibes from the secret ending.
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There could be an argument for making a bridge game that the Switch could handle and make it multiplatform for the XBone and PS4 as well. There's also the argument that the Switch is selling like pancakes with the addition of the Lite. Any developer would be enticed to try and get those sales. I honestly think it's imminent that the Switch will get the entire KH collection and Sora on Smash.The last thing people want to do is buy a new console again, only to have the main games on PlayStation/Xbox. Even if it made sense business-wise, they're gonna have to port it over eventually OR just make it multi-plat for all.
If they did something like Persona 5 Scramble, that's one thing because everyone can play. But a Switch Exclusive? Highly, highly doubt it.
Judging on how they release and develop KH games it varies, usually it's 1-2 or 3-7 years for a new KH game (depending of the KH title) to come out. For the first KH game, development started in the year 2000 and ended in late 2001/early 2002 (Jan./Feb. 2002) which means development lasted for 2 years. For Kingdom Hearts II, development started after the release of KH Final Mix in December 2002 and lasted until 2005 (2 1/2-3 years).I dont even think that idea was a good at the time they bought some time with the remakes but it was putting more or a strain on the team to get things done faster to accomadate this plan. Id be happy with a late 21 - mid 22 release for the next game to be honest