Sirrom,
I think that I would still rather have one elevator half working instead of one servo trying to overpower another one.
In the event one of the servos were to drive to one end, yes the other half/other servo would be in big trouble. A crash would most likely result. But, in the event that the dead servo stayed in the "trail position", or close to it, the other half should be capable of landing the airplane.
Please explain how you know that one elevator half will not fly the airplane. Did you lose one servo and experience a crash?
Please explain that one to all of us.

Harley Condra
BVM REP
Servo killer
harness fryer