Expected? Yes it is. On the basis of everything the filmmakers have said thus far, yes it is.
Wished for by a minority? Seemingly so, at least among the fanbase. Which is SO bizarre! You don't want your little franchise to do well? To be validated by having esteemed, big names attached to it? I want that. That'd be so surreal because the franchise has been B-movie-fied to death. Oh, and Shane wishes for it, too.
Yeah and when they were a non-lister, they'd be in any movie. If Ben Affleck was a nobody, of course he'd fervently take part in this movie. It's like what Oprah said. "Lots of people want to ride with you in the limo, but what you want is someone who will take the bus with you."