My biggest concern by far is that investors and supporters of alternative systems have been superseded by speculators who have driven the price up. As fast as the price has been driven up, it can also crash back down to earth, taking out many latecomers to the market. This will potentially put people off crypto's for life and give them a bad name.
I'm not a fan of bitcoin, I think it has some fundamental problems, but the blockchain and hashgraph are game changing technologies that will change the way we do business in the future.