That old saying, the market can remain irrational longer than you can remains solvent.
The only question is whether or not bitcoin will be useful for anything after the crash. It's already fairly well established that it's not useful for actually purchasing goods or services outside the black market, given its transaction times, transaction costs, blockchain size/unwieldiness, volatility, not to mention its nebulous legal state in much of the world.
Post crash, when it's neither a useful currency nor a speculative tool for fleecing the greater fool ... what'll it be good for?
It'll be interesting to watch.