In the next twenty years ultra thin film lithium ion battery technology will dominate the market as will nano-electronics allowing full powered mods to be as small as a pack of chewing gum. Wicking material and resistance wire will be a thing of the past replaced by an induced injection system that precisely meters juice into an induction heated chamber where it instantly vaporizes. Self cleaning so no maintenance or fuss just fill and vape. Electromagnetic charging allows the mod to "top up" automatically anytime it's within close proximity of an electric source. User selectable variable vapor density and vapor temperature will be the control parameters rather than watts or volts.
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Twenty years from now vaping will have returned to its roots, an underground fringe activity. The $5 per ml juice tax imposed by most states after FDA regulation in 2016 wasn't the triggering event, nor was the 2018 ban of RBA's or any device not specifically owned/approved by BT. It was the clean-air child endangerment laws of 2020 passed by President Horris Pill ex-CEO of the world's largest phama company, Nico-Sticker, that turned the tide by making the act of vaping in public a class A felony.