I still think bitcoin is an asset, and it's hard to call it currency.
Because currency is going to be widely used, and bitcoin is hard to use on a large scale right now, I expect the lightning network to change everything.
The cost of mining doesnt really matters if we are in profit at the end of the day, gold cant be mined sitting at home neither silver can be, but bitcoin is just setup and forget with a little maintenance once in a while, whatever be it the question being bitcoin is an asset or currency, I will say all of these cryptos including bitcoin and precious metals like silver and gold are more of investments then day to day currency and hence they are assets rather then currency.