David Smith, on deciding to go iOS 7-only for his next app updates:
Today, I’ve reverted my position again. I am going to be aggressively adopting iOS 7 exclusively in my apps.
This change is mostly a result not so much of the technical or business implications of supporting legacy versions but of quality assurance needs. I have been able to manage working out the technical needs of supporting both versions but I have found that the time and energy required to test and validate the applications on both is becoming too much of a burden.
Aside from a technological standpoint, I think the most important factor to consider is that users can't wait to get their hands on iOS 7. The new version is a major change, and – at least based on my survey of non-geeky friends – I suspect that more people will upgrade more quickly than last year (the launch of iOS 6 surely wasn't helped by doubts surrounding Maps).