I'm not one that utilizes the "playgrounds" but I truly feel that Camp Jurassic at IoA is incredible and the kids LOVE it. Smaller kids would rather climb all over a playground than go on a dark ride...or ANY ride for that matter. A well themed playground goes a long way with the kids...and gets their "energy" out.
I personally would love to see TSI completely redone (while keeping the theme) so that it could be a huge playground covering the entire island. (Well themed like Camp Jurassic). Along with that playground, they could do a "KP" type game on the island that activates different things in the caves, fort, windmill, etc.
Now, back to Fantasyland.
Moving Dumbo is a smart move. With Scuttle's Landing, the Grotto, and the Carousel right there, Dumbo really hinders traffic flow...and makes the area REALLY congested.