Sure. Even if Trump rolls back some regs, no one is going to build a new coal plant with a 50-60 year lifetime. The regs will come roaring back in 2020 or 2024, along with new carbon taxes. The worst that will happen is that a few old dirty coal plants may delay retirement.
Helping coal MINERS makes sense
That depends on the type of "help". Handouts that encourage people to put off hard choices often do more harm than good. Development funds for Appalachia have traditionally been a bottomless pit of waste. There are good reasons that nothing other than resource extraction has been successful there. Transportation is difficult on mountain roads, and the people are poorly educated, close-minded, and unambitious.
By far the best way to help these people is to assist them in MOVING SOMEWHERE ELSE.
Disclaimer: I was born and raised in Eastern Tennessee. I have many relatives there, and all of them are doing poorly. I also have many friends and relatives that, like me, moved away, and they are doing much better.