I agree! When those new ships come on line, I think there will be more realistic DCL pricing.
Right now we will not cruise with DCL if it is more than a few hundred ($300) more than a comparable cruise. For us (as adults only) there are other cruise lines out there that more than satisfy us. Yeah, we love the Mouse, but not with huge price tags.
It will be nice for the pricing to come down when the new ships arrive. Still, don't expect the premium to disappear as the Disney cruises offer a premium. Did you know that they have bathtubs in their regular staterooms? What othe cruiseline does that? Rooms are bigger than average too. So finding a "comparable cruise" may not be easy. Disney cruises look more expensive than the lowest cost cruises, but so do the newest ships from Princess, Royal Caribbean, etc.