Not "eventually", there is clear data showing the US grid is becoming cleaner right now. No need to "bet".I'd agree that it doing so eventually is a sure thing, but the bet that it will do so soon enough to head off climate change disaster
is anything but a sure thing.
As to whether that will stop "climate change disaster", it won't. Before the end of this century the planet will be well over the 2C increase figure that there is so much discussion about. However, we still have to do everything we can to decrease the likelihood of even greater temperature increases.