The Touch ID module hashes fingerprints as part of its scanning process, so the representation of a fingerprint would be of limited use if stolen. In addition,

The Touch ID module hashes fingerprints as part of its scanning process, so the representation of a fingerprint would be of limited use if stolen. In addition, the hashes are stored within hardware that is not accessible by the iPhone's processor, so liberating the hash from the phone would require physical access and sophisticated tools.