When it comes to who has leverage here I think some of you are picking the wrong side. Sony has the leverage, hence why they have the current video game exclusivity. What is far more important to Disney right now is having Spider-man in the Marvel cinematic universe. This only happens if they have an agreement with Sony.
Sony currently has the movie rights and will continue to do so as long as they produce a Spider-man movie every 5 years. MS or Disney can try push them to make multi plat games but ultimately Sony can use movie rights to push back. The movie deal between Sony & Marvel has already been pretty rocky so they will not want to risk it ( Especially with how important Spider-man is to avengers post endgame ).
You are kidding yourself if you think any Sony produced Spider-man ends up on Xbox.