I don't see Toon Lagoon getting any love for a really long time. Really, really long time.
IoA doesn't need any attention for a while because of Kong + Hulk. Plus, TL is a major path to getting people to Kong, so there can't be any construction to cut it off. I see a Seuss ride being the next thing going into IoA personally. As for USF, they have way too much in the pipeline already. After all that's done (Fallon + F&F), the Seuss ride would be counterbalance. After Nintendo Land opens, now you shift people back to IoA with a big addition for TL area.