You have to remember that different fuels fit into different segments of the energy use pie. The immediate problem that we usually discuss here is the coming gap between supply and demand at a reasonable price, of oil and natural gas. They are liquid fuels and most of their use is in transportation.

In contrast most coal is used to generate electricity and, as I point out as part of a comment below, the public is not amenable to significant increase in that price. Which is a problem since it is largely in displacing coal that solar and wind have the potential. None of the three has a realistic chance of providing significant volumes (by which I mean over a million barrels a day) of liquid fuel in the next 20 years.

In a way coal is, however, like oil, in the latter case you only produce as much as the refineries can handle, in the same way with coal, there is not much point in producing more coal than the power stations can handle, since you can't sell it.