It's the only way to expand, though.
If everyone remained fine with the technologies available, we'd never develop. It takes people like Cameron to look at what's available, and say "Okay, but now I want a 14-foot tall Alien. Gimme.", and people like Stan Winston to say "Sounds absolutely insane! When can we start?"
Sometimes it fails spectacularly, obviously. But when it works, it lets us go from a 14 foot tall two-dudes-in-a-suit held up by a crane Alien Queen to a fully functioning animatronic Tyrannosaurus Rex.
These days, though, it's just refinement on what we've got. We've pretty much stagnated when it comes to effects - The only place to go from here is more and more realistic, not necessarily developing new technologies (Screw 3D right up its ass).
This makes me a sad panda.