So we don’t have an evolution just yet but you gave us a POW revolution, awesome stuff !!!
Personally one thing I was worried about is the fact that mining rewards will be lowered over time, due to the fact of lower block rewards and at the same time the aim is to keep transaction costs as low as possible as well, this would result in much lower hashrates, which in turn would make it that much more likely that some could attempt attacks as you have described. But now that is not longer possible, much lower mining rewards doesn’t mean higher risks, and the same time it will substantially decrease energy costs as well ! In other words there will be no need to keep transaction cost artificially high to protect against attacks. POW just got a whole lot greener from my point of view.