Maybe the companies behind each of these technologies are afraid to just jump into the market with the other upcoming potential competing technologies and they're probably waiting it out so that they don't all help each other drive the market down. If each of these technologies can produce much better results than what we have now for relatively little manufacturing cost, there's a huge market potential that could go to waste if they all jump in and compete right now...
1. RGB LED needs no color wheel or extensive cooling, and they pretty much last forever.
2. Same with Laser.
3. Plasma is just a tiny glass capsule with a small amount of rare Earth gases and a high frequency driver.
I think that the big name brands are afraid of how the simplicity of all these new techs could drive the market down. Heck you can get a decent microwave for $50 now, when they used to cost several thousand dollars when they first came out and they were always just a simple high frequency driver. But if the microwave came out at the exact same time when some sort of LED cooker and also a Laser cooker came out, none of them would have cost thousands of dollars to begin with unless there were some serious illegal price fixing going on.
Think about it, as technology improves, eventually the consumer will be able to get a phenomenal projector for the cost of a week's worth of TV dinners. That would be a long time from now, but it is inevitable because of the nature of technology to improve performance while reducing production cost combined with the nature of competition. Patents can't protect that from happening forever; mabye beyond my lifetime, but definitely not forever.
Of course there will always be improvements that could be worth paying more for and the consumers' expectations will grow to match them, especially if they sit around and talk about them on online forums