It probably depends on how much longer the iOS gold rush lasts. I think a lot of developers are on OSX (and very defensive of it) because it represents their gravy train. If the market stabilises or dies down, a lot of people will probably switch over to Linux.
What's left after the gold rush is a stabilized market. The market for iOS is still huge and growing. There are differences because gold is a finite substance. There will always be an iOS market for apps where once there was none before the App Store existed. After the gold is depleted, there no longer remains a market for gold and the gold rush is over in that instance.
