I honestly think that - unfortunately - that won't come from the declining MBP sales. Apple is the iPhone company (and partially iTunes), the rest doesn't really matter for them. Like the Mac Pro, which hasn't been redesigned for 5(!!!) years. Does it result in lower profits? Sure! Does it push Apple to change anything? Not really.
I have to agree. Also, now with "services" becoming more important with the recent announcements, hardware like the Mac will likely become more and more a product they don't care about until they can get rid of it like they did with printers, displays, airports, iPods, certain excellent software(like Aperture), etc.
When Apple die-hards like myself start looking at options, you realize it's not the company that Steve had in mind. It's now just a profit machine. Whatever makes the most profit, thats the direction they go. So much for "Think Different" ...