"The biggest issue with biometrics is that of revoking them if they get stolen..."

There are several ways to steal fingerprints. The most obvious must be a fingerprint scanner. "Scan here please"

There is a good way of revoking a fingerprint, cut the finger off. Theves may also cut off your thumb if it's needed to steal your car.

In the film Minority Report the rogue police officer had his eyeballs surgically replaced with different eyeballs. It helpled when he traveled on the Tube. He kept his original eyeballs to re-enter the pre-crime facility. Lack of proper security meant that they had not revoked his right to enter the building. (The same movie where he steals a car by climbing onto the car production line and it is built around him, then drives off)

I think RFID implants are the way to go. You can have these surgically removed and replaced with different ones. Heck I expect you could re-flash the ID number with a handheld device.