I have a question which I haven't found a good answer to will Bitcoin become worthless when there is 21 million Bitcoin in existence? If not why would they not because Bitcoin is worth as much as it is now because people want to invest to sell for more in the future when do we expect Bitcoin to reach 21 million.
Unless an unforeseeable event kills it completely, Bitcoin should continue to grow more or less exponentially until its adoption starts tapering off.
Adoption is still at the very early adopter stage. More and more ATMs are opening worldwide every day and in many places more and more businesses are starting to accept
BTC. Once people realize how much faster and easier it is to pay for things with
BTC than with credit or debit cards or even cash, more people will start using Bitcoin on a day-to-day basis.
Some people here tend to treat Bitcoin strictly as a speculative or investment vehicle, but its real future is in payments and transfers.