It really depends on what form they are eventually regulated...
If they are regulated as a drug delivery device some day, they will be VERY expensive.
In that case I would do the illegal way.
If they are regulated as a
tobacco product then a number of things MAY happen...
1) They may get somewhat more expensive
2) They may take away almost all of the flavors
3) They may be available only in tamper-proof cartomizers
4) They may be available only in reduced nicotine strengths
If any of the above happen and I find the results to be too upsetting to my way of vaporing, I will go the illegal route.
I could tolerate some reasonable increase in cost.
I could possibly tolerate only using
tobacco flavors if I can get good ones.
I could not ever tolerate tamper-proof cartomizers since I drip and intend to always drip.
I could probably tolerate reduced nicotine strengths since I only use 12mg anyway.