This isn't the same as metoo. Those guys were blacklisted for raping and/or assaulting people.We've seen with metoo how "easy" it to blacklist actors and keep them from getting work. And we are talking about the career of A-list actors here. There's a lot of money on the line for the main cast. It's their profession and they want to stay on top of the game - at least that's what I suspect. Disney has a lot more power than any of those actors. Maybe even together - which would require all of them to speak up in the first place.
We'll see how it goes, but this is a situation that will set a precedent going forward. If it's still about reacting as fast and harsh as possible or if it's going to be more nuanced.
These actors aren't going to be blacklisted or fired from their on-going franchises (Jurassic World, Avatar/Star Trek, etc.) because they together stood up for the writer/director of their last two films being the victim of a smear campaign.
Even if there -was- a blacklist implemented by Disney for their films, they still aren't the whole industry. Plenty of people would be happy to work with these actors in a way they wouldn't with sexual assailants.
And no matter what Disney isn't going to fuck with Avatar.