And I meant it...
Oh, me too. I just mean that it would seem like whether or not someone actually wanted this in their notebook would play a role in whether they'd delay getting a Macbook Pro!
I dunno... I go through on and off phases where I carry my notebook around with me, but whenever I do, I pretty invariably would prefer it to be, like you said, very thin and light. I'd make most of the same trades you would.
And given that I have a Blackberry and not an iPhone, I'd still see a lot that I'd do on a notebook -- report writing, reading journal articles and doing patient research, etc, etc.
Although I do notice that I usually don't feel the need to keep Mail or GMail open anymore on my iBook, since I have my BB sitting next to it.