Considering what we've heard about not-so-airgaps in Chrysler's hacked ECU + onboard entertainment systems, would it be so far-fetched that other systems would

Considering what we've heard about not-so-airgaps in Chrysler's hacked ECU + onboard entertainment systems, would it be so far-fetched that other systems would be used to game testing, if only ECUs were mandatory to be open? ;)