An electronic throttle failure is unlikely. It's much more likely for your ignition coils or your cam-position / crank-angle sensors to give out and leave you completely stranded than it is for the ECT to fail...

Unintended Acceleration is pretty bogus. Even on an automatic car, you can slot into neutral with the engine racing. And even in the event of throttle failure, all ECT cars nowadays are programmed to disconnect the engine from the transmission when you step on the brakes.

Never experienced unintended acceleration with a cable-throttle car? Really? It's called getting the cable stuck. And that happens much much more often than ECT UIA.