It's hardly a stage you could use for a major artist appearance - very little spectator space, and obstructs the entrance gates, as @Brad2912 already pointed out. I think @pin142 might be suggesting that you can't really call it a stage, let alone a main stage. Its a selfie platform, nothing more.
The potential for performance spaces and artist appearances in the park is huge. I've marked all potential spaces in yellow, with the current 'wiggle' main street stage in red:
BB Studios
Blue Lagoon "Carpark B"
The Badu Show stage
The Humpy Theatre
The Woolshed
The 'new' half-finished ampitheatre
Tiger Island
The Shell
Brock's Garage
The Wipeout Wave
With all of these spaces, i don't know why you'd want to clog the entrance, or main street. Plenty of room elsewhere that will also drive flow through the park, rather than bottlenecking the front gate.