Just pointing out; there exist also those who consider the possibility of a collapse of cash/dollar more likely than your estimate.
There exist those who predict the collapse of everything. That's not a valid answer.
Who are they? How many are they? What insight do they have that we don't have? Is this chance higher than the possibility of collapse for Bitcoin?
Seriously. Will it do the equivalent of being ~20k then go to 3k. Then come back to 29k? Highly unlikely. As much as people want to predict a collapse, you can't store a ton of money safely outside of Treasuries.
At this point, bitcoin is a competitor to gold as an asset store. Maybe it will be more like a currency at some point. But there's a long way to go and a lot of forces against it for that to occur.