There was an article which eluded to the possibility that at least 67 characters heroes and villains would potentially make an appearance in the Infinity War movies. They already stated recently that upcoming movies will focus on the new slate of characters and actors who have been introduced at least in Avengers: Age of Ultron. Which means Robert Downey Jr, Mark Ruffalo and others are being slowly pused out of the MCU.
There was a rumor or two circulating that Terrance Howard was difficult to deal with and there was friction between him and Robert Downey Jr and others involved which eventually led to the recasting.
Had a thought, Milia Jovovich who plays Alice from Resident Evil might make an interesting casting choice for Captain Marvel. She's got quite a few action movies under her belt and doing fight and stunts might not be that difficult.
67? Well let's see if the ones we actually know about add up to at least half of that...I'll try to go in order of their appearances in the films (minus the ones who are confirmed dead, but including the ones whose films and/or casting haven't been released yet) AND assume that they're not going to cross-pollinate any of the TV show people. Also note it's only people who actually directly contribute to the fight and/or have powers, so no Nick Fury or Coulson.
Ant-Man (Hank Pym)
Ant-Man (Scott Lang)
Wasp (Janet Van Dyne)
Wasp (Hope Van Dyne)
Mantis (who will be appearing in Guardians 2)
Well, I'll be damned, that's just about half. But still, even if you include the TV heroes, that's not nearly enough (unless you count every Inhuman that will be appearing on Agents of SHIELD, but even then...)
Let's see if the TV shows add up to the other half, just in case.
That only adds about 10. I think that talk of 67 is either extremely liberal in their definition of 'heroes' (like Pepper, Jane Foster, Darcy, etc.) or there's stuff that they're going to have to cram into each movie from now until part I of Infinity War to make that happen. But then there's also the boast that they're not going to have any heroes in common between parts I and II except for the Hulk. Curious.
Also, how old is Jovovich? They'll probably want someone late-twenties for Carol Danvers so she can be used for at least a decade. Of course at this point we're only looking at about 5 years before the strong possibility of a soft reboot that will require everyone to be recast.