I think there is nothing impact from global economic crash to Bitcoin price. Bitcoin is decentralized and the price is mostly influenced by the panic selling or coin holder itself. As long as the holders and investor is not becoming panic for this situation, bitcoin price will be on the track. On the contrary, if the holders are influenced by the global economic crash, bitcoin will potentially drop.
So, it doesn't immediately impact or affect to Bitcoin.
I agree with your discourse, that it is true Bitcoin in use for alternative payment tools, and I think for the development of Bitcoin will always improve in the future because it would not be possible Bitcoin will deteriorate if seen from the user and more fans.
Except when you realize that most of the time this will create a domino effect on bitcoin too. Most people before understanding that bitcoin is decentralised might pull their investments out in hopes of gaining their losses on stocks and whatnot. A crisis could also disrupt technology, bitcoin's primary domain. So indirectly, one way or another, bitcoin will be affected by a global economic crash.