Will the plastic MacBook get refreshed to be faster, slimmer, and less expensive this fall? Some people seem to think that might be happening. If the white plastic MacBook falls below $999, then I could see how this would be attractive for students (they may dream of a MacBook Pro, but the reality is their limited budget and bank accounts).
I also have to think that Apple will eventually come out with a smaller version of the white plastic MacBook and call it a netbook. They may not want to admit that there is a growing number of customers purchasing high-quality netbooks, but the reality is that netbooks are here to stay.