They aren't going to BAN e cigs. They probably WILL try to regulate them and they might, indeed, ban the sale of FLAVORED e cigs like they've been trying to do with regular cigarettes and cigars. They will likely insist on e liquid producers getting licensed and require outrageous lab conditions in order to get those licenses. Again, only the flavored liquids with nicotine in them will probably be banned (because of the CHIIIIILDREN, don'cha know).
It will be difficult to obtain the nicotine itself. THAT is the big issue for most of us. We can easily learn to make our own for personal use but if they start requiring special licensing in order to PURCHASE it, well....
They cannot stop us from obtaining the PG/VG/flavorings and they can't keep us from getting the equipment. It's just foodstuffs and hardware.
If Big Tobacco fights hard enough for flavors we might be able to keep those in juices with nicotine. That said, BT has no qualms about doing everything it can to put the small businesspeople out of business.
At any rate, contact your local and federal representatives and let them know how you feel and how it would affect you personally. Keep educating people around you about vaping and the positive aspects of it.
That and pay attention is all you can really do.
Well, that and run around with your arms flailing about. Which is sort of fun and great cardio.