Isn't this what innovation is about? Finding ways of solving problems? Is forcing apps to make more efficient of their use of space such a bad thing?
From what I see, your users have 3 choices: They can use your app and use up their iCloud allotment, they can use your app and not upgrade, or they can upgrade and find a mapping app that is more efficient in its use of space.
This argument is way over used. It is 'your' choice to upgrade to iOS5.
It isn't like Chrome where there are rolling updates that just get applied. You actually have to sit at your computer for a while, download the software and than install it. Many chances to turn back.
Lame argument. Microsoft offers you a "choice" of installing updates as well. What if they started deleting files put by other legitimate apps because it is slowing your computer or changing your wallpaper because its too ugly... where is the line???
From what I see, your users have 3 choices: They can use your app and use up their iCloud allotment, they can use your app and not upgrade, or they can upgrade and find a mapping app that is more efficient in its use of space.