The Daring Fireball article is obtuse and decidedly one-sided; you know how the cards are going to fall before they've even left the dealer's hand.
First, I suspect that this is only creating a pattern of diminishing returns. A smaller developer base will produce a smaller field of applications, attracting a smaller audience (...and repeat...)
Second, if you have a choice of becoming proficient on a specific subset of tools that can only be used to target a specific audience, you better hope that there are many riches to be found in your narrow niche. That is not true of the Apple store, where Chinese copy-cat apps and most favored nation statutes and poor delivery system (I never seen such a feature-poor store in my life) make extremely difficult to make a profit, never mind the fact that you first have to get over the opaque and unfathomable Apple App Approval process.
Third, programming towards a platform that is defined by such questionable ethics and so unquestionable self-serving (if you believe it is about quality you are fooling yourself ... this is about control and profit) should be considered as an ethical question as well as financial. That's un-American, I realize, but then I'm not American.
Best solution for Adobe: indefinitely delay CS5 for the Mac. Release it when Jobs is dead and is isolationist philosophy is gone with him. To be real jerks, Adobe could include a $100.00 credit towards the purchase of Windows 7 for their Mac users.