Winklevoss twins: Bitcoin will someday be worth as much as 40 times its current
Even more is possible, if finally we have a good adoption and some improvements comes and run smoothly then 40 times it seems little
Anyway Winklevoss twins should not care about it since they are already millionaire, seems like they are a little bit greedy

Big money required to push this speculation soon , just take a look how korean exchange impact bitcoin price in the end of 2017 , it's clearly big money and the price skyrocketing so fast. Without that kind factor, the growth would remain slow. Let's hope for a positive news come in the near future massively .