But most of those people who spend 3-5 hours hit the rides (GMR, ST, ToT, RnR, Toy Story) and they're out. Not many people go to the area which would be home to the expansion
So, if you add 3 new rides, then those people spend an extra hour and a half. Doesn't really solve the problem. (And it's not like
no one goes to the attractions that are proposed to be closing -- IJ and Muppets in particular draw pretty decent crowds in my experience). If they want the park to be a full day park and get people to spend 8-12 hours and they are replacing Backlot/LMA/IJ/Muppets then I would say they need to add something like 7-8 attractions to make it happen.
Now, mind you, that can certainly happen in the amount of space being talked about. 2 E-tickets, 4 B to D tickets (some could be small flat rides or compact dark rides or walk throughs) and 2 shows for example. That works. But not 3-4 attractions as has been theorized.
I'd find this plan to be more believable if the space was being used for...
1. Star Wars E-ticket (speeder bike coaster)
2. Jedi Training Academy (possibly in the Muppets theater space)
3. Millenium Falcon walk through
4. Ewok village playground
5. Mater's ride
6. Dark ride version of RSR without the race but taking you around Radiator Springs
7. Monster's Inc door coaster
8. another Pixar ride like Incredibles/Ratatouille/Up etc.
and maybe putting a new Muppets ride or show somewhere else in the park (reusing American Idol and making it park of Hollywood Blvd?).