I agree on the drive system. As far as rideability goes, sleds have come a long way over the last 10 years, but the drive system has been the same for decades (with the exception of the belt drive). I think eliminating/replacing the cvt would be a HUGE advancement in the industry.
If they can think outside the box on the Slingshot...they can certainly do it in the sled department. They STARTED that process when they designed the RUSH rear end.