Do you really think Swift 3 is ready for enterprise usage? They say the core lib is not ready yet for production usage[0]. It's not about how may breaking changes I'm willing to take but in the enterprise world there is little incentive to rewrite large code bases. Even in the start-up environment the more code you write the less excited you are about breaking changes. Also Xcode doesn't run on Linux or windows and last time I've checked MacOS was not the the OS of choice in the enterprise world so Xcode is not an option. Next claim I'm expecting is that Swift is ready for the InSight Mars lander mission.

[0] https://swift.org/core-libraries/

I see.. though it(swift 3) was just released. I didn't know the enterprise world changed so much(i.e. adopting a technology immediately after release). The core/std library `is not yet ready for production use, and in fact are still in the earliest stages of development.`

I also heard Swift 4 is likely to have breaking changes. (ABI) stability will start only on Swift 4 too.

But what do I know...? Swift is great and everyone should abandon whatever obsolete language/tools they have in favour of this shinning thing because it has a nicer syntax.