Of course that line of thinking assumes the processor is the only place there is added cost when using a duo instead of solo
What other costs are there? I was under the impression that the duo and solo were pin compatible, meaning no MB or other changes are necessary. Power and heat isn't supposed to differ much between the two either. From what I've heard, it sounds like you could even take a solo machine and swap the chip yourself, assuming they didn't solder it on (like they guy in japan did with the imac).
minderbinder, Apple's currently using the lowest-clocked Core Duo chip available in the $1999 MacBook Pro. If they put that same chip in the $1499 and $1,299 price ranges, what's going to make the $1999 MacBook Pro worth that much to a buyer?
Apple needs to differentiate with other features like they always have. Screens, drive/memory/optical configuration, case design, ethernet, bundled wireless, card slots etc.
Not to mention that there will be more chips available by the time the solos ship. With the G4 ibooks/powerbooks Apple didn't have different chips to differentiate. What's wrong with MPB with 2.2 dual and MB (formerly ibook) at 1.6 dual?
Also, we don't know that there will be a 12 or 13" macbookpro, the smaller one may be the MB with the 15 and 17 for the MBP. Also, who's to say there won't be a price drop on the MBP's down the road when the MB's ship?
I don't think it makes any sense to intentionally cripple lower end models for no good reason. After all, they're not just competing with themselves, they will also be competing with PC makers shipping lower end laptops.