There is no need to remake Predator 2, its a damn fine sequel.
Sequels are mostly not as good as the originals anyway, and even if a million people say Aliens surpassed Alien, IMO, it isn't even half as good as Alien.
Just like Predator 2 isn't half as good as the original, doesn't change it from being a good movie.
It has a new concept, its different yet kept many things from what made the original so great, i don't know much sequels where i can say that.