No one.

The amount of Bitcoin will be increased by mining though the total supply will not be increased. If the demand really increases, that is enough to talk about adding supply since the higher the demand, the better the price. If you will be adding more to that supply it will affect the price and the demand, more importantly, adding supply will not happen. Just imagine a satoshi having a price of $1000, at that point, we don't need to add more supply.