I don't think required major changes would justify the cost on Sega's end. The game was been in development, in some shape or form, since 2006.
This isn't like a Deus Ex situation where there was a good game but it suffered from missteps. And those missteps seem to have been corrected. The currently available versions of Aliens are just garbage. I honestly can't think of another way to describe it.
From various anonymous sources (I know, I know, they are the worst kind), we've been told that the Wii U version was the worst version. I doubt Demiurge interested in actively being associated with the game at this point.
I think to salvage the video game license, Sega had best just clean their hands and walk away from it for the time being. They've produced three titles from the license, with only one of those being standout (Infestation), in about 6 years.