I could swear it's C++, and I hate C++. One major factor is it runs on all environments, including via asm.js if you are inclined that way.
It might be true that most apps end up written in other things, but the most money will be made from C++, C# (via Unity) and ObjC. If your app is too easy to write it will be cloned and you won't make money from it anyway.
That's a bit oversimplification. First of all, writing in JavaScript doesn't make the app easier to clone, the programming language has very little effect on the easiness of cloning. Secondly, even if an application can be re-implemented quickly, doesn't mean one cannot make money from it. Twitter can be implemented in a single weekend, but that doesn't mean the Twitter-clone will be profitable.
Especially considering that Twitter isn't either :-).
Yep, shipping the source code for your entire application IN the application doesn't make it any easier to clone. Somebody better tell that to the Phonegap users who are dealing with knockoffs:
http://www.tuaw.com/2012/02/17/ripoff-apps-plague-some-ios-d...