Be Our Guest, Enchanted Tales w/Belle, Princess FairyTale Hall, and Mermaid, will pull in some guests in 2013, and when 7DMT opens, it is likely that MK can sustain its attendance level, and WDW is benefitting from Potterland. Almost anyway you look at it, when Potterland 2.0 opens it will bring in more tourists to Orlando, and WDW will get a percentage of these.
I get that WDW has had maintenance problems, though happily they did a good job on refurbing Splash, but while the fan in me wants to see DHS get a new ride/land, and/or Backlot upgraded into something new (maybe a fictional 1930's backlot), the realist in me knows that if DHS's attendance goes up 2.2% then there is no urgency to "fix" something which isn't broken and which is pulling in more guests.
Superficially, some folks look at DHS and figure that the park needs a Carsland, and has space for a full-sized Carsland (I doubt Lasseter would go with half a Carsland). DHS pulled in 9.9 million . . . Carsland added about 1.5 million guests, so in half a year it bumped DCA attendance from 6.3 to about 7.8 million . . . so maybe for 2013 DCA's attendance will be 9.3 million, which would still be less than DHS!
DHS has this Hollywood vibe, and despite fans wanting something new/more, there are logistical issues at DHS. Despite fans dislike of LMA, Backlot . . . they are sorely needed attractions for this park, especially with the attendance growth, though I think Backlot should be totally remade. If they do Carsland at WDW, I could see them doing it at a fifth park, the current four parks are already bursting at the seams.