Great for small projects, people coding for fun, learners, and early adopters/neophiles who enjoy keeping up with all the changes. But substantial projects need solid, stable tools.
Lots of projects more important and substantial than anything you and I have worked on have been shipped with Swift. So that argument doesn't really fly. Apps redone/adopting Swift include Twitter, Pandora, Groupon, Fitbit, etc.
(Heck, major billion-dollar companies had built parts of their production infrastructure on Node when the thing was just on very early stages).
LinkedIn gave a tech talk some time ago at the SF NSMeetup. The LI app was written since Swift 1.2 and has had a good deal of growing pains since then.
Lots of projects more important and substantial than anything you and I have worked on have been shipped with Swift. So that argument doesn't really fly. Apps redone/adopting Swift include Twitter, Pandora, Groupon, Fitbit, etc.
(Heck, major billion-dollar companies had built parts of their production infrastructure on Node when the thing was just on very early stages).