No, Bitcoin Cash as medium of exchange isn’t dead just because it had a super shitty day. In the coming months the world will see what anti-fragile means.
Apart from psychology speculation (can be difficult to predict), what is the utility of BCH atm? Banks still works just fine yes? I know that might change, but is it likely?
There may be bank problems, but even if there is, I doubt that a cryptocoin will be picking up the slack in a large way anytime soon. They just don't seem ready for that to me.