Here's something I've suspected for awhile but having watched the film twice I think more might be the case. This awakening in the force I don't believe is centered only around Rey. But around many individuals throughout the galaxy Finn and Poe included. I'm reminded of a few episodes of the Legend a Kora I saw some months ago and in that series there came a point where people who couldn't bend all of sudden could.
Of course its not just Rey who awakens, Finn clearly awakens when he lands on Jakuu and even Kylo senses it in him. Everything that happens after is clearly a fated and predetermined because as long as there isn't balance in the force the force creates an avenue to right it.