Over the lifetime of the software, anything you can do to reduce bugs is a win.
By the way, I maintain a list of Swift resources. I have almost 500 urls from the past 9 months, so you can see that Swift is gaining some adoption: http://www.h4labs.com/dev/ios/swift.html
http://www.sunsetlakesoftware.com/2014/12/02/why-were-rewrit...
Over the lifetime of the software, anything you can do to reduce bugs is a win.
By the way, I maintain a list of Swift resources. I have almost 500 urls from the past 9 months, so you can see that Swift is gaining some adoption: http://www.h4labs.com/dev/ios/swift.html