Problem with your theory: 3D movies aren't a 2009/10 thing, they've been done as far back as the 50's, and they've failed over and over and over. The last 3D craze came in the 80's with Jaws 3D, Elm Street 3D & co. It has crashed and burned even without our current choices.
Also, those improvements are actually good: would you really prefer soundless, black & white movies? Though Color had been available for quite some time before WW2. There's a critically panned movie back in its time that used it to great effect, maybe you've even heard of it. It's called "Wizard of Oz".
Hell, even Chaplin monkeyed around with sound: Some small parts of Modern Times had sound bits in a couple of scenes.
3D will probably be worth it, but currently few directors are actually good at that. 3D doesn't have to suck, but I don't think its a need-to-have thing yet. The few good 3D movies out there usually come with the red/blue glasses, no need for 3DTVs yet.