Well, we can say "we just don't know what would happen", but the most fundamental economic principles of supply and demand are at play here.
first of all supply and demand is only one of many things that can affect the price and it is a lot complicated than that simplified graph you posted.
secondly you are saying supply "AND" demand. but in your first post you are only talking about the supply and the rate at which it is being created and forget about the demand. demand doesn't has a fixed rate! in fact a big part of volatility is because of the changeable demand rate. for example at some point there is a surge of interest for bitcoin and that shoots the price up. and right now for example there is a surge of FUD which is decreasing the demand and also has slowed down adoption to a halt.