My theory is that we need to wait to see what the 'new wave' of PWs bring in late December. I don't think it is demand alone that has dried up supply, seems that they've had to temporarily shut down at least some production to address the issues. In the meantime the only devices out there are from the 'first wave' and with at least some exceptions there have been a lot of screen problems with these if the discussions here are representative. So I think it is premature to expect that there has been a true improvement in quality. At most they are weeding out the worst devices and biding time until the production issues are ironed out.
I'm pretty happy with my replacement PW, but frankly expected the screen to be better than it is. I'll probably consider (another) exchange next year, assuming there's evidence that the problems have been solved.