Personally, I think the mistake was in trying to make the first service tiltrotor a combat-lift aircraft. There are so many demands for an aircraft in that role that trying to fulfill them all and make a safe, combat-worthy airplane AND work out all the TTP for a tiltrotor was just biting off to much at once. It wouldn't have been practical to try and make the first helicopters medium-lift combat transports, either. A light attack/ultility/observation tiltrotor, say a devlopment of the XV-15 as a replacement for the UH-1N, might have eased the teething problems by working out the Big Issues first.
The Osprey will work out its kinks and it'll do fine. Just like the Bradley, F-111, M-16, etc etc. Denouncing government programs gets your name in the papers.