Isn't there some issue between the studios and the rights to the superheroes?
Recall reading something where if the studios don't keep rebooting they risk the character reverting to another studio - could've dreamt it
You are not dreaming. Fox owned the movie rights to X-Men and Fantastic Four and all its supporting characters and villains.
Sony owns Spider-Man, supporting characters and villains.
Various other characters are scattered, like Ghost Rider, Blade and others previously.
I don’t know the exact time frame but the rule was studios were required to make a movie with the character(s) within 10 years. If they don’t, rights revert back to Marvel.
Certain characters, like Spider-Man and the Hulk are special partnerships. Fox was purchased by Disney, so all those characters reverted back.
As for reboots, well, Marvel has to reboot since they are basically getting characters back now. They didn’t own the Blade rights for example, so they can’t use the past movies in their canon. I think those who just watch these movies for the sake of watching don’t understand this. What the MCU is doing is pretty unprecedented where they are trying to develop a whole universe with multiple IPs. For now anyways, they are refraining from rebooting core characters.