That could be a death blow for all encryption, not just bitcoin. We’d have much bigger problems. 

 Where does anything go? You're asking for people to speculate. There's lots of that already.

Quantum computing isn't yet what people speculate it will be, so there can only be speculation. 

 I suspect that encryption will evolve like it always has. But if it doesn't, the modern world is over anyway. Bitcoin won't matter. It would be total chaos. Production would likely slow to a crawl that's insufficient to support most of the humans alive. Most critical services would be fucked (energy, water, emergency, hospitals, etc). We'd have to figure out how to be primitive again and I suspect most humans would die. Infant mortality would skyrocket again and the average human would be considered old at 40.

Is that what you need to hear? Lol
 

 Followed 

 This sort of catastrophic thinking has a paralyzing effect on people and does nothing to actually solve problems. You can't have a definite solution to a problem that doesn't even exist yet. Technology is and has always been an iterative process over time. Developments in quantum computing and encryption will likely be made in tandum over many years. We already see that happening with encryption standards now and have with classical computing for decades. Hence the reason we don't use certain encryption schemes anymore. This isn't a new movie. 

 Any bitcoin address that you receive bitcoin in is secure against quantum computing as long as you don't spend those UTXOs and then reuse that same bitcoin address to receive additional bitcoin. 

 Why is that? (ELi5 please) 😉 

 IIUC, P2PKH.  QC can remove the H, but can't convert the PK to a SK. 

 So that’s ELIAMADEV but thanks anyway 😂