I agree as a plant electrican, I've spent many of afternoons replacing all the metal halide bulbs after a 2-3-4 year life. Ballast and bulb, plus time on each I would say is $500. I think that the bigger thing is that maintenance costs and less energy usage is key to the development of this product, however, the biggest attraction I think is the best is the less amount of light pollution that is generated by this system. Look at the photos of the hospital and you see a major difference, where the fixtures direct the light where it is needed instead of flooding it like a spot light. That means that as this technology is prefected over the years it will be much better and more efficient as this technology evolves.
LED's are the wave of the future, especially since the public has been duped into these compact florecents that are plain garbage and it takes a HAZMAT to dispose of them. Remember that those that make policy are invested or paid off by the companies that produce them. I've also had to replace a couple that I've already had been experimenting with.
I'd pick incadencents over florecents in my house anyday, but would prefer the jump to LED's. When the day comes that the incadenent is banned for sale, I'll buy a couple year's supply to passify myself until LED's take hold.