One of the problems in looking at these expansions is that everyone only wants E-ticket attractions. Some of the longest lines are on the kids rides and the whole family rides. The older crowd definitely enjoys the thrill rides, and there's nothing wrong with that. But, if there were a few more C and D level rides, people may enjoy the park experience far more, especially if they could eat more people than Astro Orbiters and speedway. The other thing Disney could work harder at, is pulling people out of MK to their other properties. Tomorrowland could improve with just 2 or 3 small additions, rather than one big addition. Something themed around Wall-E could be fun, or perhaps Meet the Robinsons (although that is a little out of date now). Or, go with a whole new story that isn't connected to a current IP.
One of the challenges facing these expansions though, is that the powers that be seem to keep scaling back the projects, and in doing that, they lose a lot of the ride capacity for the new additions. Pandora lost a ride from the original concept, and that costs you 2-3,000 people per hour. New Fantasyland lost 30-45 second on 7DMT (which cost you at least one car on the tracks) and a whole ride from its original concept, likely costing you 3-4,000 riders in total. These are opportunities to absorb park guests into neat attractions that are likely lost forever and now they need even more additions to handle the people that keep coming in.