I think it is even better for than that.
What they are doing is garanteeing a good secondary market for the AmigaOne G3. I doubt that everyone will trade their boards straight up but it sets the "minimum price" that the boards will go down to.
It also means that Eyetech will have a good reason to keep the original G3's in service (will they resell the traded ones again at a discout???)..
Regards
Darren