In order to be tamper-proof such a system would need to be protected in a number of ways. Otherwise hijackers could try to hack up the floor or ceiling to get at some power supply wiring in order to just "kill" autoflight, FADEC, etc.
Even the flight deck doors which resemble a burglar-safe door set into a chainlink fence are quite heavy. Making all the electronics compartments tamper-proof would add quite a lot of deadload.
Most airplanes I have flown with so far had some more or less easily accessible avionics compartment in the cabin and wreaking havoc in there probably wouldn't enhance the capabilities of George the Saviour.
Giving George the capability to look out for weather might be a headache, too.
Remote control looks more likely though I don't know how one would overcome the time lag.
Basically it boils down to the question whether John Public is more afraid of flying without a pilot or of flying with a pilot trying to make a religious or political statement by crashing.