I'm not placing the blame at the feet of environmentalists, so much as ruing unintended consequences.
Presumably the same environmentalists are also backing the exit from coal. Using nuclear instead would have just displaced this mining activity (for the uranium) to somewhere else in the world.
But yeah, Merkel’s nuclear shift did seem pretty rash.
RWE (the big bad evil company who wants to cut down Hambach) would like to shut down a few old and unprofitable coal burning plants. They are forbidden from doing so, because these plants "are essential to the grid". Doesn't sound obsolete to me.
This applies equally so to most nations, of course.
All told coal accounted for 37% last year. So if the trends continue (and it seems like they will), then renewables will eclipse coal by around the end of this year.
Build more solar and wind and add more energy storage to get you through the lagging periods and no more coal capacity will need to be added to the grid, nor new coal mines dug.