Windows is becoming irrelevant
And that is another proof!
An IOS developer MUST have a Mac plus MUST buy all the tooling from Apple to be able to build apps for IOS. Once you have that: the Mac is a perfectly fine machine, works very well, has a cool design, and integrates well with IOS; why would you bother spend more money buying an ugly PC plus having to be extorted even more with the bundled Slurpware-O.S. on said PC.
Why would you even bother using bootcamp on your Mac: dual booting is a pain in the a...
And why would you even bother when M$ more or less announced they are stopping phones (and probably W$-Phone-10).
If M$ wanted some relevance, they would have to give away the same code working on Mac OS with the Apple chaintool, because W$ is irrelevant here (and shortly will be irrelevant everywhere!)