I think one reason why governments weren't be able to accept bitcoin is because it can disrupt the flow of economy inside a country. Imagine having something that you can't control. What would happen? It could cause a drastic, which is good if thing goes smooth. But otherwise, it could cause chaos like the typhoon does to everything in its path. Like the typhoon, you can't control its strength, range, direction, speed etc. Similar to bitcoin, you can't control it's price, it go down or up to the extremes, which is, a significant factor to consider once it is in the economy of a country. And once it happens, bitcoin will forever be changed.