If they reverse course and everyone still refused to play out of principle, the only thing Sony learns is that they should just double down. The situation becomes a calculated move between the shareholder value linked PSN accounts create vs whatever they permanently lose in playerbase numbers, instead of a give and pull between a corporation and the community for one of its games. Not playing after they give in just tells them that there was no point in walking it back, and they might just reinstate the policy because at least they'll get that tasty user data out of whoever they didn't burn the bridge with.

I mean it's your choice, but I'm just extrapolating what your stance entails if everyone were to take it.