You're right, this is absolutely something that needs to be figured out. People buy apps, get an update, and dislike the re-design. I think this is a place whe

You're right, this is absolutely something that needs to be figured out. People buy apps, get an update, and dislike the re-design. I think this is a place where legislation should probably be explicitly hands-off, I could see something in legislating differently between access and usability, i.e. allowing apps to change pretty much however they like as long as users are fundamentally able to access the same product as before. Users wouldn't like this, but it would protect companies in some way.