It will be interesting to see how consumer welfare standard will evolve to accommodate people paying more for IAP because of app store fees. It's likely that it will.
Probably 100% of congress uses an iPhone. 100% of judges. Every lawyer. It's right in their face. 100% of them use Google, 0% use Bing. I don't think I know a single non-engineering professional, English as a first language adult who uses an Android device.
It's not some abstract situation the consumer welfare standard didn't anticipate; it's the now. Nobody is going to sympathize with arguments about choice because that hasn't been true for a while - nobody makes the choice, not among these people, for alternatives, so is there really a choice?