Ha Ha!! *cleaning stuff out of eye*
I have only ever broken one arm (I thought it broke too easily)and that was the first revision that allowed for more clearance for the steering arm. I have never broken a rear arm or hub carrier (plastic, not aluminum) but I have broken a rear outer hinge pin without breaking the other parts. They are supposed to have fixed the front arms but I haven't broken anything since. Nobody knows when/if Mugen will release a new buggy (07 maybe?)but a revision should be here around World's time. There isn't really anything that that needs fixing other than the shocks need hardcoating from the factory (this is a big one to me) and lighter Pillow balls for the front end. Everything else about the car is excellent.
I think most manufacturers will all have to re-design to match Team Losi's new layout. There is no way that having the engine that much closer to the center of the car will not be a big advantage.