Bitcoin is not a "safe heaven" asset like gold. Bitcoin is a volatile and risky asset. The BTC price would most likely collapse just like all stocks prices, if an economic collapse occurs. What economic collapse are you talking about? A collapse caused by a global war or a global natural disaster is different than a recession/depression, which is caused by wrong economic policies. I also believe that it is highly unlikely for a rapid economic collapse to happen nowadays. A slow economic decline, followed by high levels of inflation is more likely to happen in the next few years.
I'm sure that the Bitcoin blockchain is capable of surviving a global economic collapse, even if the Bitcoin price crashes down to levels below 1K USD.
Depends on how you invest into it. While it may look volatile and risky at short term if you focus too much on a quick period, we could also see that it is very valid investment for the long term, like gold or anything else.
Because in the long run, it makes you money, and if you buy right now, nobody can guarantee you what is going to happen in a month, but I am sure that if you buy now and sell 10 years later ,you are going to make a lot of money. This is what people wants, they want to make sure that they are investing into something that can make them money on the long term.
So in theory, yeah bitcoin could survive economic collapse, war, famine, virus, anything really and it has done all of those things if you look at the past. We had wars all around the world, we had starvation in all parts of the world, even the biggest economy in the world, USA, have drug and homelessness problems, and on top of that, we had covid and bitcoin was quite strong at that time too.