Wow, this is going to be crazy. Last time they had this many main characters in a Spiderman film, it didn't really work. To be fair, Venom was kind of just shoehorned in but still...
Maybe it should be a 2 parter or a trilogy. Thor is great and all but The Avengers need a new top guy to share the load. Looked like they were going to try and make it Bree Larson/Captain Marvel for a little while but perhaps not. Spiderman could be the one.
For the Avengers? Not a chance - unfortunately Sony owns full rights and I doubt Disney will cough up any more $$$$ for more usage than what they have already planned for which was to include Spiderman's story into the MCU as it is now.
Captain Marvel will be leading the Avengers (I think they said she is confirmed to have 2 more movies) and they'll likely introduce a replacement for Captain America or Iron Man (or use a different hero in their spot).
Idk about that. Disney seems to be willing to spend a lot of money for the MCU. I'm not sure though that they're actually paying any money. As I understand it under the current deal, Sony reaps all the profits for the Spider-man movies, and vice versa for Avengers movies with Spider-man. The deal is just sharing characters.
And Sony doesn't own the full rights, they own the full movie rights. So while Disney doesn't make any money for the Spider-man movies, they benefit from the character generally becoming more popular. Sony still needs Marvel's agreement for things like Marvel's Spider-man (the title of the video game which I'm almost positive includes the world Marvel at Disney's insistence), so it's in their benefit to play nice.
I have mixed feelings. The general purpose of Daredevil as a character is to put him through the wringer over and over again. As much as I loved Daredevil, I kind of like the way it turned out. If it goes on, he's only gonna suffer XD.