I think it should have a thermostat to monitor coil temperature and fans to shove the vapor into your head. And be the size of a Diver but hold 5ml juice and be no problem for me with my sausage fingers to coil and wick. Without having to use a single screwdriver.
Seriously though, there are some interesting innovations coming out all the time in RBAs. For example, the
Rose looks like it'll be the love child between an Ithaka and Kayfun. China is
cloning the Kayfun 3.1, and SvoeMesto now has a shorter, less expensive, less "over-engineered" version of the Kayfun going on sale tomorrow.
I remember David mentioning ideas for features such as cyclonic air flow and wick material as hardy as steel mesh with the saturated flavor of silica. I also suspect he has other ideas and is playing his cards close to his chest.
You know, I wouldn't have thought there could be much room for improvement in mech mods. Then came the ELA. I don't have David's imagination or talent, so all I can do is marvel as wonders I never imagined appear before my very eyes. He's got his work cut out for him designing an RBA to rule them all, though. But I'm betting that he's going to blow my mind yet again.