Don't forget that they want something at the $1000 price mark, which has been the MB for quite some time.
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well, basic macbook air 11' model costs 1000$, word air in the title emphasis thinness lightness and portability, but nowadays all not high-powered laptops are abaut thinness and lightness, 2-3 years ago it was "wow", but now it is not such a sensation, so in my opinion it will be like this:
Ipad: for internet and entertainment
Macbook (will look like macbook air): ultra portable computer for casual user and basic works (actually nowadays people really rarely use superdrive, so it isnt necessary anymore)
Macbook pro: portable computer for professionals or casual users who need better performance for heavier work
mac mini: small desktop computer for basic works
imac: powerful desktop computer for everybody
mac pro: ultra powerful desktop computer for professionals