There may be a bit of a move away from diesel for the casual RVer with some of the newer gas engines being introduced. The premium for the diesel engine at time of purchase + the higher cost of fuel + the growing complexity and emissions on the new diesel engines are turning some people away.
Of course, if you haul enough weight that you NEED a diesel there is no substitute.
Something that is a bit overstated in these threads is the surcharge at time of purchase. It's list price is around $7500 MSRP which most savvy shoppers get about 20-25% off of. So, really it's closer to 5-6K. Still a lot of money but a lot less than 9K as has been stated.