I wonder if Disney will ever consider a "thrill park" (a 5th Orlando park) to try to fill that gap? They have a few decent thrill rides (Rock 'n Roller Coaster, Expedition Everest, Space Mountain), but nothing on par with Universal, Six Flags, etc.
Thinking about it that way, I think my older two (6 and 8) might "outgrow" Disney even sooner than most. They're both thrill junkies. Grace (almost 52" at 6) has never met a roller coaster she didn't like. Just last week, she rode Titan (one of the ten fastest, tallest roller coasters in the world) and loved it. I'm not sure anything at Disney will compare after doing that.
In March/April we'll be heading to Southern California for a couple weeks or theme parks. I wonder which roller coaster she will like best -- California Screamin' (at Disney's California Adventure, one of my favorites of all time) or X2 (at Six Flags Magic Mountain, one of the most intentense roller coasters I've ever been on) or something at Universal?