Nicotine is considered a drug, is that correct? (I'm actually not 100% sure but I'd assumed that would be its classification.) In that case, yes, eventually e-cigs will be regulated, at least those that contain nicotine.
This is how things tend to go; most "drugs", etc. started out non-regulated. Alcohol, for example. And ........
I am sure this will eventually be in the government's hands...not thrilled about it but I figure it's what's on its way.