i do not see the aluminum enclosure as a requisite for a pro model, but apple obviously does (iBook, iMac, eMac all not alum enclosure; PowerBook, PowerMac all alum enclosure). I don't think anyone disagrees with me here.
What I am saying is - as a consumer - I would like to see a smaller, aluminum notebook with a dedicated graphics card with a decent amount of VRAM, option for a glossy screen, and all the other bells and whistles that are available on the MBPs and not on the MBs, such as a backlit keyboard.
i don't like the enclosure on the MB and i don't like the non-backlit keyboard, and i don't like that there's not a dedicated graphics card.
i'm not saying that i will get a chance to see these things but i know i would buy one if it was available.