Have you been converted to the cult of tubeless tires? They truly are remarkable. I ride on sharp limestone and thru hedgeapple rows, and the fact these things hold any sort of air after a ride is truly amazing. I was so mesmerized by the performance on my mountain bike, my 'city' bike now sports tubeless rims and tires. I haven't had a flat yet! (knock on wood, headed to Bentonville next weekend).

To me, this problem is mostly 'solved' unless there's a generation leap in weight savings. My tires weigh .65kg each (and thats light for MTB)! That's a lot of rotating mass that's also unsprung on the suspension.