Yes, it will be abused. As will the surveillance tech that I prefer as an alternative to crypto backdoors, on the grounds that (1) the crypto is far too important to permit backdoors, and (2) it won't be possible to stop boring everyday criminals from getting surveillance tech, let alone governments, and (3) crypto is knowledge that's already out of the bag, so sufficiently motivated bad guys can still have it without backdoors even if everyone else's crypto is broken.

That's why I can only see a plausible outcome involving radical reductions in penalties for basically everything.