and nerfing credits mean they can do more work in the background.
There's no rule saying they can't do both, though. If they're more important now than ever, then why not pay like they're that important? Instead, what we are probably going to see is an increase of importance of getting spires done, but a decrease in interest from most people in doing them, because they were doing them for the money to begin with.
You may disagree, but I'm guessing after the patch there will be a notable decline in player interest in the sites and the war overall as people move to other things after earning their cash. It happens very often after a widely enjoyed source of cash gets nerfed, almost like clockwork.