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?
Also I heard that super computers can get through all crypto wallet keys easily in a matter of days, true or false?
Yes, our technology is continuously evolving and developing but believe it or not, even cryptocurrency is also improving and developing so I don't think things like that could happen. The decentralized cryptocurrency is also adaptive about the changes so if the latest technology development would affect crypto, I'm sure that it would change features to keep it more secure.