Well, a finiancial system has to be in existence. In the eventuality of the crash of existing financial systems, cryptocurrency at the very least will experience some form of speculative adoption as a means of transacting on a large scale. A very postive outcome for the cryptocurrency market could easily be expected everything else remaining equal.
Well it will be a real adoption when crisis is at highest point and not over. If crisis lasts only briefly, I think investors or holders will be more resistant to crisis situation. Sometimes they don't know whether crypto is able to save their funds or not, because not all investors are interested in crypto and they could run to gold.
the "cryptocurrency" market aka altcoins will most probably collapse hard and we may see disappearance of at least 90% of them simply because they are all gambles with ridiculously high risks and during a financial crisis nobody goes near anything that risky with their money specially when that thing is mainly manipulated and is getting pumped and dumped.
but bitcoin could be a candidate to see a significant rise. because we have seen so far that it has always moved on its own mostly disregarding the rest of the world (and markets) with whatever is happening in them. that makes it a separate thing that could be the option for investors who would be looking for a way to save the value of their money while their fiat tanks.
Only shitcoin will collapse and not for te top altcoin, when bitcoin rises then altcoin will also be correlated even though altcoin was not interested at that time but influence bitcoin is still there. But what is clear is that bitcoin is safest from any crisis, and if you want to try a new designation I think altcoin can be a bet, because we do not know whether altcoin at that time was able to pump high or not.