I wouldn't worry about it, if it weren't for the selling power of Arnold, I doubt they'd even revisit T1, but if they do that film with his likeness, it'll do well. With Aliens, at the most Hicks with a more Biehn portrait would sell and that's it, they can't get Weaver's rights, and no one can even really name the other actors and with the right repaint most of the old heads looked pretty close anyhow.