While working on a new version of one of my apps Xcode told me today, that it cannot run the project any more because the development profile has expired.
The organi
No, revoking certificates does not affect apps already on sale. For that matter it won't even affect apps submitted for review. (We had renew a certificate while an update was in review. No problems at all)
For App Store apps, you don't need to worry. The signing information on app store binaries is only used for the initial validation to ensure it came from you. Once it has been uploaded the binary will be transformed and resigned with Apple's private key, encrypted with Fairplay, etc.
This means revoking your distribution certification will not affect live apps. You only need to worry if you have an enterprise account.