States have plenary powers. Congress has enumerated powers. If a power is not enumerated in the Constitution, then Congress can't pass a law regarding it. That's what the Framer provided to us in the Constitution.
Then came the New Deal (which SCOTUS was striking down right and left), and the FDR court packing scheme (which caused SCOTUS to change what it deemed to be constitutional), and suddenly, any law was allowed to be constitutional as long as it affected interstate commerce (because there is a Commerce power enumerated for Congress). And, the standard for affecting commerce came to be very, very loose.
In the past 20 years, SCOTUS has been tip-toeing into the concept that Congress can't do whatever it wants by merely mentioning "commerce" in the statute somewhere.
If we do get back to that, that would be great. The States would have more power to do what they want. Diversity of laws is not necessarily a bad thing, and on most issues (like commerce), the states usually adopt uniform codes (except Louisiana). But, that is kind of what makes me think Alito's draft is just a draft. If that concept wins the day, abortion will be one of the least of the issues affected. We'll see. (Note: I haven't read Alito's draft. I didn't see the point. I was going to wait until the real opinion is released.)