I think the time to push is now, not "wait and see".
WotC hasn't formally published, so they're not committed yet. Backlash now allows them two outs: either (1) internally change direction, and comply with what their customers want (presuming: retain OGL1.0 in an irrevocable state), or (2) say "that's not what we were going to do" and go public with a compliant version immediate. Both actions defuse tension.
If we wait to push and they publish 1.1 deauthorizing 1.0, and then backlash starts, the lawyers can get involved true -- but that gets convoluted and takes forever. In the face of public backlash once published, a corporation is much more likely to double down and hunker behind their lawyers, which could end up worse in the long run.
Its almost always better to deter conflict than fight. We're still in a space where deterrence can work.