To be fair (I share some of your hesitance), the old-fashioned key still works, ...

apawloski on Oct 2, 2012 | parent | context | favorite | on: Lockitron: Keyless entry using your phone

To be fair (I share some of your hesitance), the old-fashioned key still works, so if for some reason one of these dependencies was unmet, then you're not totally out of luck.