Disney is clearly gearing up to generate as much original content as Disney+ exclusives. The dump of Marvel/Star Wars show makes that evident. Due to COVID19, streaming got fast tracked to where it was heading; Disney is adapting to follow suit. They're copying NETFLIX's original plan of having a ton of content we already saw on there, then gradually add originals. The only problem that NETFLIX didn't anticipate (at least my theory) is that every other studio would eventually want to take back everything that they had, leaving them with nothing but scraps and crap. So even though NETFLIX has some critically acclaimed shows, there's nothing much else on there. Their monthly reveals have been trash for so long now.
Disney on the other hand is in the position to keep churning out and keep people on the line. They can even screw over NETFLIX even more by bringing back Punisher, Jessica Jones, Luke Cage and Daredevil on Disney+ (they can skip Iron Fist please). So I really doubt that Disney will do what NETFLIX is doing now by bringing out a show and cancelling it. Disney is way smarter than that, they can clearly see the backlash that NETFLIX gets for doing that and Disney wants to dominate (as per usual) the streaming service market. They already have MARVEL exclusive fans signing up for Disney+, Star Wars exclusive fans signing up, and now they can tap into a market that they have long ignored - gamers. KH3 opened Disney's eyes to the cash cow that the KH franchise was (I'm actually not too happy with that), but Disney will milk KH for what it's worth if they do the series. There is no way they will stop free promotion for old and new franchises AND new content for their service after one season. KH is like a dream come true for Disney.
That isn't what I'm saying.
Most of their existing original content is slated to be standalone series or only have a handful of seasons, and 90% of what they announced during their Investor Day were also standalone or limited series. Only a handful of their tentpole projects will get a bunch of seasons or tie-ins (i.e. The Mandalorian with the Book of Boba Fett, Loki is getting a second season, Percy Jackson if things go well) and unless it is a blowout success, everything else will likely stay the course set right now.
They aren't trying to make long-running series right now. They are trying to build their catalogue as quickly as possible. They will adapt as they go and give big hits more seasons (if it fits their plans), and eventually they will start to automatically release non-SW and Marvel shows with multiple seasons already planned, but you're expecting too much from Disney.
Disney still doesn't even really have a grip on D+ yet despite the good sub numbers. They've been struggling behind the scenes to lock in the right executive team to help them navigate the streaming service market, and much of what they announced during the Investor Day was a big gamble of theirs to make sure they proved they had the content to back the service properly. We'll be waiting a long time for those projects to release (or waiting to see if some of them get canned which is almost assured to happen).
Kingdom Hearts, while being a great opportunity for them, is not going to get a multi-season deal off the bat. It'll have to earn it like everything else that is new and untested in the TV market, and since it is being developed internally at SE according to insiders, it'll have any even harder time proving itself.
Again, Disney can't even give their best and most popular animated shows more than three seasons and there is a graveyard of series over the years with only one season behind them. Disney isn't about to give an outside company a better deal than their own internal projects.
To expect Kingdom Hearts to succeed where these other shows failed is foolish and putting ourselves up for disappointment. KH can be adapted in so many ways without being an adaption of the games directly. Also limiting SE to one season might be better creatively anyways. It would mean it would have to introduce and answer the majority of their questions in the show instead of trying to create sequel-bait.
In regards to the Netflix Marvel stuff, we do sort of already know that Feige might bring them into the MCU (spoiler rumor for SM3:
apparently Daredevil will be in Spider-Man 3). I doubt he's going to revive their shows as we knew them, though lol. Feige appreciated what those shows did but he's more interested in the characters and how to implement them into his plans, not the shows themselves. I could see a revival of them waaaaaay down the line after Phase 4, which we won't be out of until 2024 at the earliest. And this would also be long after he's introduced these characters in some way in Phase 4 shows and films.