But Bingo, how does the saga end now?

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

That makes even less sense than if Luke, a leader fo the rebellion, went into the heart of the Empire and killed the main baddie and the people went "ah crap. this is on e badass. okay, I give up. you win."

Such a bold move, the death of the Emperor and Vader, would be a double whammy that would cut the empire off at its core.

God, I just had a cool image. It's too bad we don't have footage of Luke hauling Vader around. You could take that footage and have him emerge from the palace with his father slumped on his shoulder and then have these huge crowds that have gathered stand aside as Luke carries his mortally wounded father to a shuttle.

Maybe many imperials would see Luke with Vader and immediately kneel before him? Basically saying, "youve won. Now you can be our new emperor."

Oh what could have been with a proper ROTJ.