It is hard to claim that stable coin will be the future of crypto as there is no guarantee that it will not fail, we have already seen failed stable coins in the market for example, NuBits and Basis and the reason for failure are different in both these cases and we all know about the issues for USDT and their transparency issues and their legal troubles, so to consider stable coins as the future you need to think about how you are going to trust the audits and how different countries will be regulating them.