But... we do have a plan, which is to just not do it in spite of any crisis or whatever. He is misleadingly framing it here like we don't have the ability to backdoor encryption which has never been the problem.
He clearly states that what we need to be weary about is public opinion changing, which is basically like saying that we should just get ready to compromise our standards in preparation for the day where reactionary desire is able to overcome our "sober" thinking of the present, or else fear the government coming in and doing it sloppily and by force.
Clearly that's irrational. We should resist it now and we should resist it then too, for just the same reasons we resist it now. There's no technology issue here, just an ethical/political one.