Frankly, replace the amphitheater and Rockit with a Minions wild-mouse and a flat. Then put a “concert plaza” in the KidZone that can dump straight back and behind ET straight through the Esoteric Gate (or straight into CityWalk).
That way you can still do a massive show without blocking a main thoroughfare in and out of the park.
You can actually fit the current plaza on top of Curious George, and still enough space for Mummy AND Gringotts to pretty much fit. Take the space, build a VelociCoaster-esque, F&F launch coaster with city-scape background (Tokyo!) with the concert plaza and you fix a LOT.
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