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I'll believe that when I see xcode running on ios.

"More developers now use OS X than Linux, says ‘most comprehensive survey ever conducted [by StackOverflow]’" http://9to5mac.com/2016/03/18/os-x-versus-linux-developers/

Because Linux was always the most popular desktop environment...

For developers, yes.

No, read Stack Overflow's survey. Just over half of the developers use Windows.