It's extremely unlikely vaping will be banned, but having to buy it at exorbitant prices with Big Tobacco's 600+ chemical cocktail is essentially the same thing to me.
I have three heirloom quality, owner-rebuildable, mechanical mods with spare parts and two good RBAs each for them. Even though it will still be available, I probably have a lifetime supply of resistance wire and organic cotton balls. As long as there are flashlights, there will be batteries.
Most importantly, I probably have enough nic base in the freezer my heirs will get some. At my age, that's not as much as it sounds. Tractor Supply will still carry PG, and Wal-Mart and Krogers, VG, but I have some anyway since I DIY. There will be plenty of nice, used vaping hardware for pennies on the dollar from those who don't hoard nic. If you buy any, just be careful not to let them discover your identity and hence where your nic stash resides, or you may have a burglary.
I came to vaping very much addicted to the nicotine in pipes and cigars, never planning not to smoke my stash. I don't inhale into my lungs like I did for decades with cigarettes. I got by for years at one time on dip and chew, so if I lost all my vaping stash, I'd use Swedish snus. I do now in lieu of stealth vaping.