Wait, wait for it, it will change.
RV's just like cars have ebbs and tides of popularity. Several years ago you didn't see fifth wheels on the interstate now that is all you see and they keep getting BIGGER and BIGGER each year! :B
It's liken to the big honkin SUV craze years ago. They've gone by the wayside and now all you see are those cloned Ed Begley green cars! I suspect with the newer generation being so green conscious the RV styles will have to change if they want to keep selling them.
All the types of RV's have seen their day in the sun. It changes like the weather only it takes longer.:C