Why thank you captain sarcasm. I REALIZED that the current generation of systems don't directly tie into engine management systems. However continually stick more and more crap into a system leaves for the potentiality of more and more problems. Hell, one day someone might actually make a virus that gets in there and screws with the in car systems.
Hell here's possibility: these systems become standardized. So instead of hardware hackers tinkering with the devices from one maker they all only have to learn how to mess around with the one most common system or OS. Well by general numbers a certain amount of those guys are going to be full on black hat and there's no telling what kind of 'fun' they'll have then. Personally I wonder what would happen if someone made a hack that locks the in car stereo at maximum. Or... hell... could someone make the display suddenly show a high rate flashing image that can trigger a seizure? That would cause all kinds of havoc.
I FREELY admit that these are all really out there concepts. However I still contend that this idea could lead to them actually becoming a reality. Especially if automakers end up being lazy with their code.