Well, given that there’s also a rumored showdown that will happen between Luke, Rey and the Knights of Ren, it’s seems likely that there will be another major status quo shift in the Force during The Last Jedi.
Maybe Luke Skywalker will die during the conflict against Snoke and The First Order, leaving Rey as the only one left to continue his legacy.
Who knows, maybe there’s a slim chance that more Jedi survived the Knights of Ren’s slaughter than previously implied.
Maybe somehow Kylo Ren will be redeemed during the story and join Luke and Rey by their side as the last Jedi, plural.