As someone who has looked at hotel rates for on property Disneyland hotels (and off property ones too) a lot over the past couple years, I would say that the studio rates estimated by
@AstroBlasters are at least a couple hundred a night below average for low season, high season is still probably below what I've seen Disney charge on busy weekends and last minute rates-- I think what I'm saying is that if the economy and travel demand remains strong, even with all the extra fees, you're still getting a pretty decent discount to booking at the Disneyland Hotel for studios and an even bigger discount for 1 bedrooms (I never look at 2 bedrooms, but I'd presume it's true as well). On the other hand, if the economy or Anaheim tourism crashes, you could see DL hotel rooms at/below 300 with some regularity, especially with Disney's various Magic Key/local resident promotions. If I had high convinction that DL was going to build out all the proposed areas around the Disneyland hotel, I would probably buy (especially with an incentive)-- but for the moment I'd prefer to pay the same to be at Grand Californian resale.