I completely agree on this,just look at bitcoin's trading volume and the transactions made.Yes,only a small percentage of people are using it regularly,but as bitcoin makes it's progress we will witness how it's slowly becoming a global factor.
yeah bitcoin has the potential to continue to grow. I saw bitcoin users continues to grow it proved when I see number of users in a local exchanger in my country always grow up ? bitcoin growing dude 
and perhaps a few more decades will become a global currency. lets hope