I really get the feeling that the amount of people that have the attitude of "I'm only getting a Mac if it's the 13" MacBook Pro" are in the vast minority. Then again, a lot of people switch to Apple because it is prettier and I don't quite fathom the logic on that one. Oh wait, there isn't any,
How do you reason this? If anything, they will discontinue the 17 inch, which I also don't see as likely. The 13 far outsells both the 15 and 17 inch. The 13 sells so well that Apple has 3 different 13 inch laptops, all which fill different niche markets. Stopping the 13 inch MBP with its current success makes about as much sense as Trojan stopping condom production and switching to making soft drinks.
Most people can't afford the 2 grand for the 15/17, and most students don't need the power nor do they want the bulk. With that said, I like the backlit keyboard, I like the nicer trackpad, and I like being able to put my own common SSD in. If they stop the 13, my money goes somewhere else. If they stop the 13, they are going to lose quite a few prospective customers, especially considering their stronghold in higher education.