Granted, the Fontana course is tame in comparison to World Cup standards
Very tame. Short too.
This is a very insightful comment:
For downhill to grow and develop as an international sport, we need Americans needs to be part of it. It is supposed to be the fastest, most demanding pinnacle of our sport. If one of your top national race series is being won on trail bikes, you can't help but wonder if some people are missing the point...
With USA Cycling leading the way, it won't grow and any money it makes is siphoned off to developing road talent. A guy can win a downhill contest on a 29er because most national-level talent is spread all over the country, not getting paid, and therefore will not travel to race each other.
I don't have a bias one way or another when it comes to wheel size.