It won't happen, except at airports where a particular airline is the only airline served from that checkpoint.

Last time up, Continental sued United to have their templates removed from airports where they shared checkpoints.

It will only take one customer-focused airline (like CO, VX, B6) to scuttle this.

I recall having to bend one up until it almost broke off in order to get my bag through the x-ray at EWR back during the late 90s. My bag was fine for the CO flight I was on, but not for UA who was sharing that concourse at the time - the x-ray operator tried to insist I comply with UA's restrictions, but I just manhandled the template until my bag went through.