Can't wait until they start selling plug & play laser headlight kits for everyone to put in their halogen headlight housings! It's gonna be great!
That being said, I don't understand why people are asking "why"? Why not!?! It's the next step in the evolution of lighting technology. Why did we need HID's when we had halogens? Why did we need LED screens when we had LCD screens? Why send exploration sattelites to Mars when we've already put a man on the moon? It's human nature to expand on what we have and make things better!!
Because we want to make things better, more energy effecient, more reliable, etc. Who knows, soon you might have a laser TV in your living room...
We can't settle for "good enough"!