I have not read a concrete evidence that suggest that the market will crash if there is already a vaccine for CoVid, actually it's already a done deal, we have CoVid vaccine coming within 3 months that is a guaranty, but look at the market, they are still doing great, if the speculation is true the market should start crashing now, but it's not happening and I don;t think it even if the vaccine is out.
I think that defeating the virus, on the contrary, will lead to the growth of bitcoin. Bitcoin directly depends on the global economy - if everything is good with it, then it grows, if a collapse occurs, then it falls. I think all remembering the March events. This fall surprised many people, but it was logical as the global economy was crumbling and the outlook was very bleak.
This gonna be a complicated situation
I mean indeed when the united nations announced that covid 19 is officially a pandemic in march all of the financial market crashed suddenly included bitcoin.
With this logic people will assumed that when the good news about vaccine to come , the market will gained even more as investor found the full confidence.
But on the other hand it is makes some people worried that the money invested during pandemic into an assets like bitcoin will get withdrawn and back to invest in real life assest like properties.
This is the reason why bitcoin could crash.