Hah, like there is any doubt that she'll become a Jedi. It's basically Episode IV all over again. Han Solo instead of Obi Wan, Rey instead of Luke, First Order instead of the Empire, Kylo Ren instead of Darth Vader.
We like hearing a story we already know. Rey is well on her way to become a Jedi, probably in two-movies' time.
1: Seems pretty clear that The Force Awakens is an "...origin story of a female Jedi." [1]
2: At some point while writing this I realised I would spend all evening if I had to round up all the planets, and chose to note that the lists are "non-exhaustive" instead :)
We like hearing a story we already know. Rey is well on her way to become a Jedi, probably in two-movies' time.