Yeah, as much as I agree with healthcare reform and mandated insurance, the auto insurance analogy just doesn't really fit. Thing is, routine maintenance isn't covered in auto insurance. Auto insurance exists to protect the driver in case of a breakdown on the road, or to pay for the damages caused in an accident with another driver.
Routine maintenance, on the other hand, is what's covered in most warranties and roadside assistance plans offered by dealerships and automotive clubs. And frankly, if you know anything about what's under your hood and you have the resources to do so, you can perform 99% of routine maintenance yourself.
So, I guess if you want to continue with the auto insurance metaphor, HCR right now is more like a combination of auto insurance and warranty coverage. Can you do routine things like maintain a healthy diet, exercise, stop smoking, and limit drinking yourself? Yes, but the insurranty exists to protect people who can't.