I couldn't agree more. Things fail, you cannot rely on electrical/power assist functions in all cases so as a responsible motor vehicle operator you should be required to know what to do in the event that one or more of these systems fails. In fact, it should be mandatory to receive a driver's license. A pilot has to demonstrate the ability to handle an engine failure before receiving their license, and a motorcyclist has to demonstrate the ability to handle the bike with the front tire locked up in a panic stop before getting theirs, so why not car drivers having the same requirements?
In addition, it saddens me to see manual gearboxes being nearly nonexistent in North America, as that also gives you far better control over your vehicle in a situation like this. Something weird going on with your engine? Step 1, put in the clutch. Step 2, put it in neutral (which many automatics won't let you do at highway speeds any more), step 3, sort it out on the shoulder. Works for both an engine that dies unexpectedly, as well as those alleged reports of stuck throttles.