I've been following the traffic on the possiblle FDA ban on this site, and I think we will prevail. Here's why:
We're pretty resourceful. I'm an aerospace engineer, and I work with electrical engineers. If the FDA prevails, I'm pretty sure I could hand my PV to one of them, and they could reverse engineer it in a heatbeat. Of course, early prototypes would be bulky and ugly, but we would finally find a way make our own. Many of you on the modders forum here have already done some impressive things with your standard rigs. The only setback would be that the price would surely go up since we don't have the cheap labor force and materials the Chinese have.
I don't think any FDA ban would slow us down for a minute. We may have to go underground, but I'm pretty sure I'd see vapers standing outside restaurants toking away on jury-rigged set-ups!
Hey, if they'd banned tobacco, many of us (pre e cig) would have grown our own plants and found a way to roll our own cigarettes. This is no different. It's not rocket science, people, and I should know. Hang in there, and don't panic. Sure, stock up on cheap supplies while you can, but don't throw yourself off the bridge just yet.