This line of thinking – mechanical keys are not perfect and sometimes don't work properly, therefore we must replace them with something else – fails to take into consideration that whatever we replace it with will also not be perfect and will also sometimes not work properly, especially in new and unexpected ways that we are not prepared for. Fact is, the mechanical ignition key is a pretty well-debugged piece of technology. It isn't fundamentally broken, and doesn't need to be "fixed" by throwing it out and hastily replacing it with something else, especially something without a century of usage behind it.
I'll be honest: I'm an old-fashioned person who liked having the ability to shut off a computer by physically opening the circuit that powered it (i.e. flipping a big crimson switch). As a tech, I get frustrated with equipment that has a "power button" that really only serves to put the device in low-power standby mode, such that turning it "off" and back "on" doesn't reinitialize it (requiring me to instead pull the power cable from the wall ... which only works if it doesn't have a battery). The "open the pod bay doors, Hal" approach doesn't give me warm fuzzies, mostly due to experience with the real world where new technology routinely fails to live up to the naïve expectations of the young and/or credulous.