But, why does it need to die out? Outside of these bootleg cartridges which were obviously something done by a rookie there have only been complications from vaping to 1-2 individuals a year. That's nothing, literally, nothing. As a whole, it's a healthier way to use nicotine without all the complications. The nicotine, by itself, mind you is no more harmful than caffeine -- it's all the weird crap tobacco companies pump into their products. Secondly, the other health concern is huffing carbon monoxide all day which causes cancer -- something that doesn't happen with the vape. (When you are vaping you are inhaling a steam, not a burnt product. The vape juice is merely heated to a point where it aerosols not to any cooking point...)
Likewise, even the THC products would be safer than smoking weed directly via burning so despite these defective products I see no reason to change anything there.
As far as ease of production of vape juice -- it's cheap, about $50 in supplies and you can make enough for years.