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?
Not all new technologies are related to finance. And there are no new directions in the financial sphere yet. Therefore, for now, fears for cryptocurrency are unnecessary here. Cryptocurrency has just begun to develop and it does it quite quickly. It looks like it still has a lot of potential for use.
As for technologies such as quantum computing, there are different opinions in this regard, including those that are not entirely pleasant for cryptocurrency. Quantum computers have already appeared and their power is growing. Theoretically, there is a danger to the existence of cryptocurrency, but no one knows what will happen in practice.