I agree that that is the direction they need to go, but since Orlando is mecca for families, I think it should be a less extreme iron park. By that I mean that I think Mako is a great step towards that direction. It's a solid "big boy" coaster, but it's not a very extreme coaster. Manta is similar. So in that vein, after Sesame Street, here is what I would do.
1. Replace the water ski stadium with "Luna Lagoon"- a turn of the century sea side amusement boardwalk that has a large but not extreme white "wooden" coaster backdrop, large ferris wheel, wave swinger, tilt-a-whirl, octopus, and a carousel. And an old school Haunted House ride themed to a Pirate Ship. The key to this area is it has to be beautiful. So really overdo the Victorian era Seven Seas theme. And the flats have to be well themed and integrated with themed platforms and landscaping. Also lots of fountains. Since the namesake, Luna Park was a showcase for Edison's new electric lights, popcorn lights out the wazoo. The place should be stunning at night.
2. B&M Flyer near/around Clyde and Seamore.
3. Jet ski coaster near Manatee Rescue.
4. Add a Mack Mad Mouse to Sesame Street land.
6. Turn the whole place into a botanical garden. I mean, just go nuts. Make it look like the Flower & Garden Festival and Cypress Gardens had a love child.
5. 500 room "value" resort with lounge, lazy river, and exclusive park entrance.