I'd be cool with Rey leading the charge on a new religion. One where it is ok to have feelings and attachments, but not like the Sith where the only feelings allowed are negative. The way it has been is either be void of emotion (Jedi), or be overcome with anger and hate (Sith). Both have led to suffering time and time again. When we re-met Luke, it felt like that was the route he was going, but they didn't really capitalize on it.