Akwat Kbrana said:

The Emperor is dead and suddenly stormtroopers are crowd surfing on Coruscant amidst fireworks.

That stormtrooper wasn't crowd surfing; he was being thrashed by an angry mob sick and tired of Imperial repression! Do you really think lifting things from the Wizard of Oz will make for a more believable ending? Maybe rather than falling down the reactor shaft, the emperor can float away in a hot air balloon, and Luke goes home to Tatooine by clicking his ruby slippers together...

And why did Coruscant suddenly become a place of an uprising?

Are you suggesting that Luke could in fact escape the palace now that the masses have risen up?

THANK YOU.

Coruscant in ROTJ is plausible based on what's already shown in the SEs.