I'm trying to think of the best way for both parties to continue this partnership long-term in an amicable manner.
But of course, the smart thing to do would be for Sony to poach someone from Marvel Studios to be the Feige of their SUMC. I mean, the head of Sony Pictures Entertainment and Motion Picture Group came from Fox. The head of SPTV came from Hulu (and previously Fox). The head of Sony Pictures Animation was poached from DreamWorks. Rothman immediately poached Gabler and Fox 2000 to form 3000 Pictures when Disney closed that studio down. So clearly Sony is not above poaching from the competition.
If Sony can get someone with an iota of intelligence to map out their universe from Marvel Studios with Feige's blessing, Marvel can have Spider-Man for crossover events and Sony only shares profits with them for the main solo Spider-Man films, I don't know how this isn't the best way forward for both corporations and fans.
I don't think this deal is sustainable long term, but we'll see. In 2-4 years we'll be doing the same dance. This dance will end with either Disney acquiring the license in full or Sony yanking the property to go on their own IMO.
Problem with "getting their own Feige" is that Feige is a genius savant. Not easy to replicate. And the problem with your last sentence is how to share profits and ownership. Why would Marvel and Disney help develop another Cinematic Universe if they don't have an ownership stake in it, at the very least? Or don't get compensated appropriately? You're better off using Feige to expand the MCU even further with TV shows and 4 movies a year and/or expand the Star Wars universe where you get all the proceeds.
Can DIsney just completely buy back Spidey please?
Another Spidey movie with Sony involved is like a new fresh pair of shoes with a damn rock in it.
After the next 2 mcu appearances we'll just be back here again waiting for them to either pull the plug or - if we're lucky - extend it once again.
Can they? Yes. Will they? No.
The license is worth A LOT more to Sony than it is to Disney. If the situation was reversed (i.e. worth more to Disney than Sony) then the license would have been bought. To a lesser extent it's the same situation as Hulk and Universal, it's worth more to Comcast to keep it from Disney than it is for Disney to pay for it. Same with the theme park rights. Same with Indy rights from Paramount.
When Disney wanted something, they overpaid (at the time) and got it, i.e. Paramount distribution rights.
Unlikely. With Men In Black disappointing, Sony doesn't really have any more movies to kick-start a new franchise. I don't know how Charlie's Angels going to perform and if it flops, only franchise stopping Sony Pictures from going down under is Spider-Man.
So, They are not going to let go their only money maker for anything. Best case scenario would be to extend the current deal with holland appearing in other mcu films (like Civil War)
Charlie's Angels looks just okay and without the charm that DIaz, Liu, and Berrymore brought. Naomi Scott got some name recognition and charm due to Aladdin, but not enough to make it a hit. Jumanji still needs to prove itself as a franchise and might suffer the 2nd movie nostalgia remake drop that SW, Jurrasic, etc suffered. Sony is going to double down on Spidey even more IMO. I think they should just rid themselves of this division and double down on PS. They can't compete. They could also double down like CBSViacom is doing, but choices for that are getting more and more limited.