I don't think the title of the movie is referencing Rey is it? They were talking about Luke. Because Rey isn't a Jedi. Wasn't tearing down the Jedi religion a sub plot of the movie? Now there's just those with an affinity to the "light" or "dark" side of the force.
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Perhaps so, but Yoda says something along the lines of "you don't need a bunch of books to learn the Jedi way." I feel like that whole conflict was one of the weaker parts of the film.
I suppose your idea makes more sense, as we learned that Ben would no longer want to affiliate himself with the first order, so it seems that everyone is straying away from the old fashioned values and beliefs of the old movies.