Agreed - not mature, but as you said, more mature. We're probably about here on the tech curve:
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I think the next big thing will be consolidation. Successful companies will buy others, and BT will start buying them all up- changing the landscape to a less diverse, less innovative, more "sterile" and streamlined vape market, with only a few big players.
Technologically, something like ultrasonic might be developed to be feasible for vaping. But regardless, I think the whole wick/coil thing will go away. It's really a pretty primitive way to heat the liquid, if you think about it.
My guess is, engineers will develop a way to heat the juice in a way that all the tds & crud will develop on a removable/disposable plate or unit, that's easy to remove and replace on the fly, without any disassembly. The heating element will remain, and the device will likely use some sort of injection system that won't require wicking material, gravity, vacuum, or capillary action.
Don't forget if any of you develop this, that you'll want to pay me at least a token commission for the free idea.