Being able to externalize pollution is a subsidy. Accounting for externalized costs, coal is about parity with wind in terms of cost, though gas is ahead of both.
Agreed, but with the price of oil headed below $80/barrel, shale and other fracking operations that are expensive to operate are now going to operate at a loss (causing some producers to go bankrupt). You're going to see the cost of natgas dip down, and if enough producers go out of business, jump back up to new highs as production will have dropped quite a bit.