Bitcoin wasn't created in the first place to be the number one global currency,satoshi's idea was simply to create a digital currency severed from our well known fiat currencies,it can be purchased with fiat,but that's were it ends, it's totally in the hands of the users,investors and enthusiast in the system
What could be more user-friendly than putting control in the hands of the users???
The problem is that there are still many things beyond users' control. Exchanges are currently required to use cryptocurrency, and they can be shut down by governments or hacked.
I agree that BTC wasn't created to be one global currency, but all trends seem to suggest that this is where we're headed. I don't think it will be bitcoin, but I do think it will be an altcoin that fixes the fundamental flaws.