I've read a number of different estimates for deaths related to coal pollution, 10-15K annually in the US, 150-300K globally. Even if those estimates are 10 time actual, it is hard to beat coal pollution as the top killer for industrial activity. Disasters like collapses of mines, dams, coal ash pond get a lot more attention.
Turning off every coal plant today would be a much bigger disaster -- people freezing, starving, diseases, etc. would be far worse, but hey, I am all for replacing coal with safer nukes, etc. All major systems will results in accidents and deaths, it is kind of the way it is. Even today, $/kwh from coal is generally cheaper than the viable alternatives. Arguably, a new generation of nuclear power could be cheaper than coal (fuel costs on the order of 15-25% of coal), but this is certainly not guaranteed.
You still need transportation fuels (hard to replace jet planes with battery operated or nuclear).,