First of all, his statement was consumer-oriented. If consumers don't agree with Apple's business practices and their rationale for them (as you don't), then consumers will refuse to buy Apple products.
If developers act rationally and if the cost of having to be restricted by Apple's platform outweighs the benefit of targeting "the most profitable platform" they will switch platforms. Otherwise they will stay with Apple's platform. I.e. if benefit of being unrestricted (i.e. not developing for Apple's platform) - cost of "doubling workload" (assuming this is true; I don't know) > benefit of developing for "most profitable platform (Apple's)" - cost of being restricted then developers will develop elsewhere.
What he is saying is that there is nothing wrong with Apple's practices because they will suffer if the market doesn't like it and will benefit if they do. That makes perfect sense and in fact is inherently rational so there's nothing intelligent or unintelligent about it (because it's not really an opinion; he's just stating a fact (assuming rationality) and extending it to this situation).
RIM does have an app store (
http://na.blackberry.com/eng/services/appworld/) and his whole point was that competitors with higher phone market share are TRYING to establish their own competing app stores, so if developers don't like Apple's platform they will move (as noted above). It's not always about which App Store is most profitable right now (again, assuming developers are rational). If the cost of feeling restricted > the benefit of developing for a large target market to the developer then developers will switch. As more and more developers switch, network effects will increase and other app platforms will become more profitable. I.e. market forces will ensure the platform that is most favored by consumers and developers are successful.
Anticompetitive would mean Apple is preventing other app stores from competing.
I personally think Apple's decisions make strategic sense; the point of what Robert Reich is saying (and what I agree with), however, is that if Apple is wrong, the market will prove it to them (and prove me wrong). I don't have a stake in Apple's success, so in either case it will be an interesting case study.