I think you'll safely get a few years out of the skill set, as even if it starts downhill now IOS has a large footprint. It's also not a bad way to get familia

I think you'll safely get a few years out of the skill set, as even if it starts downhill now IOS has a large footprint. It's also not a bad way to get familiar with objective C, and many of the tools and frameworks can be used for OS X development.