I like the video and generally agree with the analysis of how Johnson is trying to break down the binary viewpoint and affirming that the Force is self-balancing. But I think the final third of the film re-affirms the fact of the Force self-balancing. If Rey had agreed with Ren to rule the galaxy together, it would have only been superficially a balance. In reality, the dark side would have been in charge, with both seeking power without balance. The balance is in the conflict. Thus, for the Force to achieve balance, the Force had to re-establish the power of the good, and the conflict must continue.
What I would love to see is the conflict happening in something other than war or destruction, but that is kinda the calling card of the dark side, so I guess not.