in present bitcoin is spreading too fast.though all people of world not using bitcoin but in the future bitcoin will spreas more & more. Many country will accept bitcoin like fiat and many store,shop will accept bitcoin as a payment method. So,bitcoin will be more popular in future.
with the passage of time bitcoin users will continue to grow in the future, when the need for something requires a lot of money then the withdraw money through the bank have maximum limit and restriction policy will bring the money that will be key to success bitcoin in the future.
Can't really predict the future of bitcoin because looking back at it's progress, we can actually see just how fast of a phase bitcoin is changing. From roughly 7 years(?), it has gone from nearly invaluable to this much. What more in the future? Considering that we're nearing to supply cap, anything can happen now.
Looking at the last 7 years that bitcoin has good increasing every year even there are some decrease. I think the future of bitcoin just like anothers currencies that would be using worldwide due to it's advantages which common bank doesn't has.