Would it really be too expensive for certification and testing for them to put in a new drivetrain? It would be cheaper than a whole new model, because half the work is done. All you need is an engine and suspension, the body is done already. Because we all know common sense says that that would save this model, but obviously Honda thinks it wouldn't be worth it.. Same applies to the RX-8. All it needed was a new motor and it could have soldiered on.
PS I wish you couldn't advertise in Imperial mpg... you can't buy an imperial gallon of gas anywhere...