Something to also consider regarding potential spinoffs (which I dont see as likely aside from MAYBE Wolverine, one or two others. Storm could feature heavily in a BP sequel) is that Marvel Studios isnt gonna do more than 3 movies a year, Feige has said this. Its too much work to bite off.
So theres three per year - theyve got to finish trilogies for Guardians/Ant Man/Doctor Strange/Spidey/Black Panther/Captain Marvel. Theyre gonna keep doing an Avengers/team-up every three years. We know Black Widow and Eternals are both likely movies, along with an all-female teamup. Feige has basically said that Miss Marvel is coming once Captain Marvel is more established so they can play the legacy/inspiration angle. Its possible that some of the original heroes that have already gotten trilogies might get one more (I dont expect Cap 4, Iron Man 4 AND Thor 4, but one of those wouldnt surprise that much.) Weve got whatever the cosmic plans for Marvel that James Gunn was gonna be a huge part of post-phase 3.
Now also include ANY other surprises/wildcards the MCU might reveal for Phase 4 such as a Thunderbolts or Young Avengers/Champions movie. Plus surely now a Fantastic Four trilogy, a main X-Men trilogy, and its entirely possible that Deadpool 3/X-Force still gets made by the MCU in some capacity because Deadpool/Ryan Reynolds is such a cultural juggernaut and if any aspect of the Fox X-Men universe could survive a merger its meta Deadpool (they could flat out say in the movie hey I know its confusing but would you rather recast me?)
Now think about all of those movies. And think about only 3 a year. And lets be real, its not what I want but if theres ANY X-Men solo spinoff, another Wolverine is coming first. How likely does anyone really think it is that were getting say a Rogue movie?
EDIT: plus, I think if any former Fox characters get solo movies in the MCU, theyre gonna be either Deadpool, Silver Surfer or Doom.
