How would you know if you were buying raw or pasteurized milk if there were no food labelling regulations obligating people to label it accordingly?
Just like I do now. I look for milk labeled "pasteurized" and make sure it's from a trusted vendor/brand or has a trusted certification.
There's a competitive advantage to labeling food, and there's no stopping companies from labeling food in the absence of food labeling regulations. The most trusted organic certification is from a for-profit certification company, Quality Assurance International. McDonald's published nutrition information before it was required by any law. Intentionally incorrect labeling is already covered by fraud and tort law.
You're not going to convince me that I would still buy raw milk, or that pasteurized milk would be unavailable, in the absence of FDA regulation.