I'd like to say that I'd pay good money to see this in the theater, but let's face it - this is about as long as you can carry the joke without requiring way too much thought.
(Also, fuck that pussy-ass Predator. Robocop will cold ruin his shit.)
Well, technically speaking, the Predators hunt anything that is challenging to hunt. Once every few decades or so. So what if they're assholes, they're the alien species, not a half-man half-machine like Robocop or a machine in man's clothing like the Terminator. Hard meat, soft meat, it makes no real difference. They've got fucking laserbeams, and nukes on their wrists instead of a cyanide pill.
But yeah, that was a pretty dickish move. No collecting trophies at all! Having a Terminator skull on the wall is one thing Sarah Connor has that the Predators don't.
Man, that's it. Predator VS Terminator VS Sarah Connor VS Robocop VS Ellen Ripley VS Alien. If I can't have it in mash-up form, I'll take it in comic book form.