bank on it
If it can be broken, somebody will.
Admittedly you shouldn't make it easy for them.. but remember the days when your phone was just a phone? Not really sure why it had to become the single place you keep all your data any more than why your car keys didn't become the same thing.
I don't use my fingerprint on my phone to activate recognition so I can log onto my bank, touchID does log me in (most of the time) to the phone but then I go online and enter a ton of details. If you stole my fingerprint I'm not really sure what good it would do you in my case.