I would still say based on the practicality if you look at any cryptocurrency it would falter under the load of transactions as large as the whole US for example. So it's a bit early to bet the farm on any one of them. Also if a govt will support cryptocurrency they will create their own one so they can profit off their own ponzi, so to speak. They wouldn't be in favor of enriching Bitcoin whales just to take advantage of the 1s and 0s previously established in the btc Blockchain