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(I'm going to assume it's not sarcastic)

Pretty much the entire world is trying to get rid of Coal on their grid. It's expensive and has (rightfully) a bad image.

So let's assume a brand new car lasts 10 years, by the time that car is ready to be changed, the grid has evolved to the point coal is irrelevant. The whole operation is still better than a buying a new petrol car.

I mean, shouldn't they be trying to find a way to replace revenue loss from dropping gas usage? Presumably a good portion of that gas tax is going towards maintaining automobile-oriented infrastructure (roads bridges etc) which EVs also need.

Is that sarcastic about the coal plant? Depending on the plant, it's most likely better for the environment to forego ICE emissions and replace with BEV via coal. But even so, once you remove that coal, you have the BEV in place!