IMHO, if BTC gets the place it deserves it won't have to be THE currency but A currency. We're now just below 5bn total. Imagine 5bn, being 50bn or even 500bn. There's a place in the chart that there's no turning back. I guess we will have to wait a bit for it to happen (if it happens at all anyway). But do not limit your thoughts to micro transactions. There are about a gazillion other coins for that.