Are cryptocurrencies a threat to the dollar?
Personally, I do not think so?
In general yes,because if most of the countries will allow the cryptocurrencies to be used by the people,it can replace the fiat and banking system which is why cryptocurrencies are created.But it will be too hard for our community to expand in most countries because the super power countries are has some regulations or limit to cryptocurrencies today,like U.S and China these countries has some influence to other small countries.Personally, I do not think so?
It has some sense of course. But crypto should pass a very hard way to become a real threat. Moreover I think that there may appear governments' protocols (for taking taxes and tracking personal activity) and regulations which will force to implement them. I suppose in this case private coins will surely be in a great demand.