I think it will be very big because it is already on the rise right now and after 5 years a lot ore people will know about it and trust it and then they can make a lot of money from it but i am not sure we are never sure about the future what could and what will happen.
Maybe bitcoin will have a verry big population because it is now really popular because of its amazing price i believe that this coming years bitcoin will be more amazing and a verry good way of gaining extra income many will be surprised on bitcoin and in five years it will almost covered the half of the world population.because this bitcoin is really the thing that really needed in our life it is a blessing .