Those product delineations exist currently.
Macbook Air has always been touted as " high end specs, flexibility all with great portability". The Pro was sold as the mobile beast. There's some range confusion it seems.
There's so much range confusion over at Apple right now it's starting to feel like the 90's all over again.
Compare the Macbook with the 13" Macbook Pro, there's a ridiculous amount of overlap there that makes their pricing structure seem ridiculous.
Comments here suggest many of us would pay a premium for something like this.