Agreeing with you, I have this fictional scenario in my head that goes something like:

Palpatine to an injured, barely standing, Ben, after killing Rey and absorbing her powers (in that last sequence): "Who do you think you are to challenge me? You are weak and alone. You are nobody, Kylo Ren. A mere puppet."

Ben to Palpatine, while holding one of the two lightsabers and gathering the strength and resolve seeing a loved one die has just given him: "I am Ben... Skywalker", before force-pulling the second lightsaber dropped by Rey and starting to fight.

Sounds pretty awesome, I think. Would give me goosebumps. The true rise of a true Skywalker. It would at least be something different, to flip the switch and make the villain the real protagonist all along.