From the little that I've managed to learn, it seems like cryptocurrencies have immense potential but, beside the natural opposition from those who prefer the "conservative way of doing things" (due to a variety of reasons, some legitimate and some less so), it seems that the blockchain (as ingenious as it is) does not really scale well to handle a global economy. There are ongoing efforts and solutions to solve this but I think they are all essentially equivalent to a person trying to do crazy contortions in order to wear in a badly made suit. There are a few projects that propose interesting and scalable alternatives to blockchain but once the herd has decided then I assume more money will be poured on making a wrong solution workable than making a right solution the standard.