In the future when pretty much all the coins have been mined. People put an estimate for how much the market cap of bitcoin will be, and then divide by 21 million to get the value per coin, and they will buy if it's significantly higher than what it is now. So the price is essentially completely dictated by the total possible value of all bitcoins, divided by 21 million.
The error in your reasoning is that all those 21m bitcoins will be available to you if you are willing to pay the market price.
I’m Hoarding Bitcoins, and No You Can’t Have AnySecondly if you look at the halving from a dollar value demand perspective and assume that currently all mined bitcoins are sold immediately:
3600
BTC x 250$ = currently 900,000$ demand per day.
Now lets assume that the dollar value demand is still the same after the halving and that all mined bitcoins are still sold immediately (1800
BTC instead of 3600
BTC).
Something has to move. The dollar value of a bitcoin has to double to 500$ or the current holders need to be willing to supply those extra 1800
BTC per day. Each day, every day.
It will likely be a combination of the two.
See, again, you're looking at bitcoin as something like food. A consumable whose main purpose is NOT speculation.
In that case, the supply reasoning works. But what I was trying to tell you, is bitcoin doesn't work that way. 99+% of the value of bitcoin currently comes from speculation, can we agree on that?
If so, what that means, is that the VAST majority of people owning bitcoins are in hopes of it rising in value. That's the value proposition for them; it's why they bought/mined bitcoins in the first place. It's why they're holding.
IF they cannot expect an increase in value, then there is absolutely no reason for them to hold bitcoins. In which case, they will sell. Again, we're under the assumption that bitcoin does not yet have enough intrinsic value to justify even a fraction of its current price.
But what that means, is that demand and supply are HEAVILY influenced by the price. Let's say the price increases from $200 to $300 (as an example). The people who thought that bitcoin is a good deal at $200-$299 will start selling, because the price is already over their threshold, causing a much higher supply.
Because people don't have a need to buy bitcoins (unlike food, clothes, etc), even if the supply is low, as long as they think it's overpriced, they will not buy it.
Now again, I agree that PERHAPS the halving will have some effect; I said less than 5% but probably less than 1%. I'm not saying it will have absolutely 0 effect.
What I am saying, is that
you can't just take the halving by itself, ignore all other variables (because you don't know them) and confidently make predictions about the future. The halving is one, small variable in the grand scheme of things, doing that would be like claiming you know the strength of the US army vs the strength of the Russian army because, well, you have a friend who is an American solider and and a friend who is a Russian solider. Let's ignore the rest of the military because we don't know, right?