I don't think they could make it a controlled substance, just regulate who can sell it and how, make QC too difficult for ours smallish vendors to be able to conform to, putting it back in the hands of our favorite people, big pharma.
IDK if they could really regulate hardware. I mean, I can go to plenty of shops on the beach and buy paraphernalia. It is perfectly legal to own, as long as there is no illegal residue in it. (Not that I have any interest in said paraphernalia, just using as an example.) If they do, I have an I pro that will last, and 3 vivi novas that I can rebuild ("with some semblance of competence"...

love that, Orobas!!!)
PG and VG have other uses, so I don't think those will be regulated either. And flavorings are used for food, so they will still be around.
I checked my order history and I ordered a 250 ml bottle of nic 3/12 and another 7/12. I just cracked the seal on the one I bought 7/12. Thinking I will order maybe another 500 ml. That should be plenty to last me at least long enough to wean myself off the nic, which I intend to do anyway.
These are just my unresearched thoughts on the subject, don't put too much stock into them. If you have other ideas or research, please feel free to educate me!