Nope, they're quite easy. That's why Apple's already released the updates (6.1.6 and 7.0.4) with the new certificates.
What the people who won't leave iOS 6 apparently fail to understand/just ignore is that iOS Software Update only checks for the latest version. It simply finds the latest version and downloads it to update. So, for devices compatible with iOS 7, that version is 7.0.4. There is no "select which version to update to", so it's physically impossible for Apple to push 6.1.6 to these devices without disabling updates to iOS 7 altogether, which they clearly aren't going to do.
The moral of the story is: move on with your life and update your device.