I don’t need that villain to take off his mask and show me his tender heart, how he’s really a good guy deep down inside and we all need to turn him back to the good side. Fuck that guy. I want Rey to defeat him. I want to see him punished for all the evil things he’s done. This isn’t General Hospital. I want to see the good guys win and the bad guys lose. That is Star Wars to me.
I don’t think we will see him turn good. Although similar to Anakin is some respects who turns to the Dark side out of desperation, at least in the case in ROTS, but you get hints at it when talking to Luke - “It is too late for me” etc. Kylo seems hell bent on the dark side out of choice alone. He’s much younger than Vader and not as battle hardened so we don’t get the pure mechanical villain.