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Not an iPhone user, but I wonder if you could access the key data manually and restore it afterwards? On Android that's possible (if you have root....) by accessing the key database (sqlite in that case). I did that to duplicate the keys from my handset to my tablet.
ProTip: rename your auth entry to something like "Gmail foo@example" to avoid this problem, whether malicious or accidental.
For those looking for Google Authenticator alternatives, I recommend either Duo Mobile from Duo Security or Authy. I ditched Google Authenticator a while ago and haven't missed it one bit -- having a single app manage my two-factor tokens / keys is much more convenient.
In light of this incident with GA, do either/any of the alternative support "export" of the underlying secrets, for instance to migrate to a new app?
Chris Messina has a solution: https://twitter.com/chrismessina/status/375118991280205824
That's only good for Google accounts. Dropbox and others aren't reset as easily.
When I add sites to Authenticator, I take a screenshot of the QR code and tuck it away in an encrypted document (OneNote for the record, which uses uses AES to encrypt).
Have you tested this? Are the barcodes not time pertinent?
I was still signed into Google so that was easy enough to generate a new key, but I believe I'm going to have to use my backup number to get into Dropbox.