I think they might want to move into a similar direction to what Blomkamp is proposing, but then do it without the Ripley, Hicks, and Newt characters.
OR go in it with the Episode VII mentality. Give the characters significant roles in the story, just not action roles, then pass the torch off to the new actors.
I'm fine either way. I think it would've been a fun what if, but if what ifs don't happen, that's cool too.