With dual battery packs and dual switches, it is quite remote for the receiver to loose power.

If the firewall is pulled out and a choke servo is installed, the choke servo push-rod actually tries to pull the choke to close. The fuel line can be pulled out as well (maybe ignite a fire when the gas touches the hot muffler).

The real danger is loose control due to receiver failure. To which, a dual receiver system is desirable and if the throttle or choke servo is separately controlled by the two receivers, killing the engine is always possible.