The world of technology is evolving every year what if in future a new tech is been born that can kill crypto or works better than crypto won't this kill cryptocurrencies?
Lol this is just your theory and it never proven. It seems like that you didn't understood perfectly how crypto works and how crypto was even become quantum computer resistant caused by the implementation of SHA. Super computer will never kill crypto and it's better for you to read more literature rather than try to create a non sense speculation like this. So many people didn't even know how this works.
Also I heard that super computers can get through all crypto wallet keys easily in a matter of days, true or false?
false. People never try to get a proper resource about that. There was also quantum computer resistaince. It's better for you to read about what it is. I hope that will give you at least a small insight about that.
Even some members called that as a reason why the dump happened. What the heck.