The problem with this approach is that it only works if you're #1 with a comfortable lead. Apple is #2 and fast losing mind share, and this kind of policy is only going to accelerate that trend.
That sounds like bad business to me. You should nurture and support your best customers/clients. There are 1 million apps on the App Store. Apple just figured some of the others deserve their support. It's harsh but understandable.
I think the policy of only catering to shops that are 100% developing on the Apple platforms is a terrible strategic mistake, especially since they are now #2 in this market and fast losing market share.
Also, catering to exclusives doesn't guarantee that you only get great apps in your store. Actually, it guarantees nothing except for acrimony from developers and the feeling that Apple is a fickle partner that can slam the door on them at any time.
The best way to regain market share is not to accelerate insulation but to woo companies developing on Android back by convincing them that iOS is a superior platform to develop for. As it is, all they are doing is convincing more and more developers that in doubt, they should develop for Android first and iOS second.
They are basically repeating the same mistakes Jobs made two decades ago which led to the almost bankruptcy of Apple. Granted, they have enough money in the bank to be safe from this, but this kind of behavior is simply accelerating the decay of their market share, and as a consequence of that, of their profits.
That sounds like hubris and arrogance to me. Are you so sure that won't be changing anytime soon?
Q2 2013: Apple +230%
Q3 2013: Apple +210%
Q4 2013: Apple +110%
Q1 2014: Apple +85%
Apple's definitely on top right now, but the gap is narrowing very, very quickly.