if the demand stay the same(very likely) the price must rise to accommodate the fact that there will be less dumping, this is a fact
if the demand rise you will get an amount that is above x2 of current price(because of the 12.5 reward)
if the demand decline you will get the same price as now(because of the 12.5 reward)
33% chance that it will double due to halving, 33% that it will increase above the doubling of the halving, and 33% that it will stay the same
Your assumptions are questionable and the math doesn't work that way because:
1. Supply and demand include all bitcoins, not just newly minted ones.
2. Supply and demand are curves and their intersection determines the price.
3. The halving doesn't decrease the money supply, it decreases the growth of the money supply.
4. Those outcomes not the only possible outcomes and the probabilities are just wild guesses.
i just made it simple without all the hassle about it, i know there are more variables in play(like miners efficiency)
well you can lock one and predict how the market will play, this how you do it with two variables
i was not talking about the total supply of course, but about the mined supply, which is the block reward...
they aren't wild guesses at all, they are all based about what will happen if the demand changes in only 3 possible ways, up, down, remain the same
up and remain the same are in our favor, because of the supply halving unless miners efficiency will be so big, that they will consume 1/2 of what they consume now to match the halving, which is impossible
and there is no guessing here, the efficiency doesn't double within a year, actually it is more slim than many think, around 10%
and anyway it is a matter of simple logic, we know what will happen with the supply, so the only real variable is the demand here, the other variable is the coins that are held by early adopters, but i will not take those into consideration because they are a big portion of demand too, so we can consider them neutral
fact 1 if the demand rise the price must rise, because the supply(mined supply, aka block reward) will be halved
fact 2 if the demand stay the same, the price must rise, because the reward will be halved
fact 3 if the demand decline the price will probably decline, it depend on how much it will decline, because if the decline will not be greater, than the less absorbtion that the market need to absorb, because there are less coins dumped from the miners, then the price will stay the same
so we have two cases where the price will go up and one where it will probably go down, now it is clear like the sun that there are more chances of an increase than a decrease, here no one was talking about a 100% increase scenario, only probability, like always it work