Only worry is the inevitable greater demand for used lenses, when they figure out that they can use K, M or A series glass and get great results!
Regarding the DA L lenses, I've had the 18-55mm since July and never had any problems. The front element doesn't rotate when focussing, which is a step ahead of the F and FA zooms that I have. It feels light, but the zoom ring is nicely damped and the photos are excellent considering that it's intended to be a cheap kit lens. I think it might be the 50mm f2 of our times.