I don't even worry about if the wipe will take place or not really. I have a passcode policy that will wipe the device after X number of failed attempts. That's the protection I need for offline devices. Increasing numbers of thefts are immediately placed into faraday bags, shielding them from network signals until the thief gets to a spot where they can attempt access without any network connections. The passcode policy is the true wall between your device and a thief IMO.