@jbankston
There isn't really any need to hoard - well, any more than the average vaper does, with 50 backups...
It's true that the FDA will start down the road of trying to put ecigs out of business, as soon as they can get their ducks in a row, because that is their job. Even before the court cases start up we know they'll have to leave 2-piece carto tobacco flavor models sold in B&M alone because that section of the industry has too much financial muscle now, and can't be quietly buried. The question is what else has the financial clout to survive.
However many things have to happen first: they have to give notice of regulations; the trade complain; the FDA bring in the disputed regulation regardless; the trade take them to court; one side wins; the other side gives notice of an appeal; the original decision is either upheld or overturned; the losing party takes it to a higher court; and so on.
It doesn't happen overnight.
What this means is that if, for example, e-liquid is banned (as the FDA will try to do at some stage), then there will be months of wrangling before that either comes into effect or is overturned. If the regulation stands, then US firms will go offshore in order to stay in business, and supplies will be mailed in - much as you can buy meds from India with no problem even though they are 'banned' here. Web hosts and warehousing in Mexico etc will start to do a nice trade. Laws are no use unless they can be enforced, and laws preventing people from buying things they want are the least successful of all. A law preventing access to things that people have an absolute right to, by any possible moral or ethical judgement, would not be likely to be a tremendous success. There is a finite limit to corruption and eventually it goes too far to succeed, as it needs to stay out of sight.
So don't worry be happy.