It's won, but will take a decade to pac-man a good chunk of the world. It's the money/currency pairing btc/usd that's really going to do the damage though. These two will develop an exceedingly more intimate relationship. Invincible 21st century industrial money. Most can't see that or why its tether to energy is the recycling mechanism of doom for all global value.

Legal tender is unnecessary. Larger market cap will come in time, as will more usage.