I know that a lot of helicopter guys whine and moan about it, but this whole "Osprey can't autorotate" thing is just silly. First of all, do we take CH-53E's out, shut all three engines off and go to the ground? Do we take King Airs up and shut 'em both off and glide to a landing? Why would we ever do that?
Secondly, let's think about when an Osprey autorotation would be necessary? The thing would not be converted to helicopter mode way up high - they do that when they're descending and decelerating for landing. Meaning that the Osprey would be quite low...probably too low to successfully transition from powered flight to autorotation.
We have to get off this thinking that a total power-off event could happen to multi-engine aircraft. We need to accept the fact that if it ever happens, it won't be pretty. So have the crews practice it in the sims. And then hope they never have to do it for real.