Certainly, the days of plastic are truly gone and being honest, the plastic cracked everywhere - just like my old iMac did with age. I have the white MacBook as my backup and the plastic really doesn't last. Even the plastic bezel came unglued in parts from the screen at 1 yer old. Also, the BlueTooth never worked from day 1. I remember reading reports a while ago about dodgy bluetooth antennas in some of them? Sad, as I've never been sable to use AirDrop on it which would save so much time.
However, it would be lovely to see a white aluminium MacBook. That would look pretty beautiful IMO.