The distinctive blue look in Cameron's films was never "natural", it was always added or pumped up in the lab. As we've pointed out, if you watch the trailers for T2, you can see a lot of scenes with their original colors, as filmed. (Examples: Arnold and John on the motorcycle, the hospital chase, the Cyberdyne shootout.)
I thought Aliens was scanned from the original negatives, meaning that the color timing, which was done at an intermediate stage, did not exist in the scan and had to be done over from scratch. (Correct me if I'm wrong.)
But just because the "blue" color timing was done at a later stage doesn't make it any less legitimate - those were Cameron's original color choices, and him altering them is IMO just as bad as Vittorio Storaro's insistence on cropping his own Panavision compositions to his now-preferred 2:1 ratio. We still can't get The Last Emperor in its original AR just because its cinematographer has gone insane...but I digress.
Point is, I think the industry has almost become too deferential to the wishes of the filmmaker, in the here and now, rather than what they put down on film then. Lucas with Star Wars, Cimino with Heaven's Gate, Coppola with Apocalypse Now (thank goodness he eventually relented, and also that Storaro's reframing decision was finally overruled)...I shudder to think what might have happened if Ridley Scott had insisted that the Final Cut of Blade Runner be the only available version...
That's not to say the studios can't make awful decisions on their own (because they certainly do), but I wonder whether, if the filmmakers weren't involved, some of these films might have had releases which looked more authentic to the theatrical presentations...