Yeah, thats something hard to predict, but then again bitcoin is an old tech and has lots of issues. OK and other similar concepts seem much more likely to be widely used (if they survive) as they are more efficient, faster and have lower transaction fees. I mean whats the point of buying coffe with btc if you have to wait for a 30+mins to get verification and the fee is likely higher then the price of your coffee... We'll see how things turn out. I guess only time will tell.