What will be the value of one Bitcoin when the number of users (people that will want to use Bitcoin) will hit 21 millions?
At this point, if each user wanted to have 1 Bitcoin, will have to pay a certain number of $ or or Y, whatever. I'm going with $ just because it's the most used around the world.
How many $ do you think that person, the n. 21 millionth, who wants to buy 1 BTC will have to pay to obtain it?
My wild guess is: 160000 $.
A lot more than we thing probably. Always take into account there are way less coins available than 21 million, a ton of them are lost forever, and a lot more aren't even mined yet, so if that threshold is surpassed the price goes higher. I cant honestly give you an exact number. I like the Xapo's CEO prediction: between 500.000 and 1 MM dollars.