Apple is a function of profitability, that`s one of the reasons they are where they are now as a tech company. Apple has always looked to streamline their product line since SJ returned to the helm and dont see any change to that strategy anytime soon. product lines selling in volume will be enhanced and refined, product that does not meet Apple`s stringent profit margins will be cut.
As for the fate of the 17" MBP we will all see soon enough, I for one would like the 17" go on and evolve, however I rather fear that the time has come. Last time I enquired about a 17" I was advised it would need to be a special order as they are not stocked due to the lack of demand, which frankly speaks volumes.
The 17" MBP for many is an icon, even if they have no aspiration to own one, yet if it`s not profitable in volume or brings some other significant tangible benefit to Apple, same as many the 17" will become a part of Apple`s past...