We can't find any tank bigger than 23 mm on the market right now, correct me if I'm wrong crew. So I would say that would be useless to dig it so wide. 23mm is the way to go...so far. Anyway most mods are 22, RBA makers won't move too far from that I reckon, unless they also produce the mods to suit them (I know a modder is working on a 26650 tube mod, and will also create the atty that goes with it, that dude from the Origen, can't remember his name right now).
Now, there's a market for 26650 mods for sure, some guys will always look for autonomy and will always be ready to compromise on size to get there. 26650, usb charger...what else could you ask for. I would see that as a home or car RSM, maybe not the most appropriate thing to vape on walking in the street or at the restaurant