Yeah, bitcoin is far too taboo for it to be declared as a national currency by any of the developed nations. Where it will likely happen first is with a developing nation experiencing hyperinflation. Those in developed nations have gotten spoiled by decades of relatively stable fiat currencies. However, in developing nations there is no luxury of being snotty about such matters.
I agree. However, I won't brand it taboo because that would mean that it would be something that would make it sort of illegal to use or to invest with. I think, it's just the trust of the community that affects how people view cryptocurrencies, or Bitcoin, for that matter. As much as it is beginning to make a name for itself in the world market, I am not sure if it has risen to the capacity wherein its competent and reliable enough to be used as a national currency. People in every locality or country have trusted their local currencies for many years due to many reasons like it being backed by the government. That would surely and truly make people at ease to use it or invest in it, unlike Bitcoin or cryptocurrencies, which is some sort of a hit or miss type situation. Not very many people are willing to risk it, especially if the point of conversation is money.