I have read an article in the past in which a certain CEO from a very well known company has told to the people that bitcoin investment is the next big thing and that its market price can even reach to million per bitcoin. It may seem so very high but my speculation is with that price too.
After 2020 block halving, bitcoin can make another amazing price rally in the global exchange markets. Some people says $500,000 and $300,000 for the future price of bitcoin, but I think this is very possible. The supply of bitcoin will be decreased significantly.