Again, as much as I'd like to agree with you, none of the prominent app developers are going to be leaving anytime soon. And, as for people who make Farting apps, they probably wont care anyways because use Objective-C or Actionscript, the apps are rather simple anyways. The efficiency of writing code probably wont matter to them.
They certainly won't start whining about it.
Awesome thing is, though, that you can reasonably compete as a Tier C developer with Tier B and Tier A developers, it's just that they get a head start with being featured. That's surmountable, so it's not a big deal.
They're a business.
For every clojure zealot, there are probably 10 objective-c developers who will be happy with less competition.