What's with you people and the need for an optical drive???? Obviously such laptop would not be your only machine, you are looking at a market where someone has the power they want at home or at work (be it a iMac or a MacPro) and they want the portability outside. Personnally, I would be willing to even ditch the Ethernet card in such laptop if that can save some space and allow it to run cooler (my main issue with my PB).
TV an iMac or other Mac and a wireless network. The laptop would be an addition too your life, sync it up.. maybe we will see that user folder on your iPod concept applied here.