As was pointed out right above me, all the FDA has to do is to ban any e-cig device made after such and such a date, until further research has validated its usefulness and safety. This is already in their proposed deeming regulations.
The FDA & Deeming Regulations of E-cigarettes
Doing such could effectively kill the e-cig industry, as most devices in use will have been manufactured after that date. Most of the e-cig vendors are small mom-and-pop businesses that could never afford such a research study alone. It's doubtful even an e-cig vendors business group could generate the sponsorship to do such a study. And such studies could take several years to complete and present to the FDA.
We will have to rely on CASAA to present some common sense logic to the FDA. We may or may not have Big Tobacco supporting us, as their group seems to represent two differing representations. A couple companies who have acquired e-cig companies will be protecting their investments, while the have-not tobacco companies likely will see e-cigs as competition to their traditional nicotine product. Of course, Big Pharmacy will oppose us 100% as they have the most to lose to keeping e-cigs available.
It likely will be an uphill battle for e-cig success with the FDA.