the idea of adjustable frame tension with air pressure is interesting. It might take a fair bit of air pressure to give it structure and that means pumps. pumps of course add weight. and beg for multiple uses, ie., inflatable strut tent, lighting fires, inflating pads etc.
Maybe light bladders inside cuban pack would work. I've been involved with inflatable kite design for years with kitesurfing and bladders/valves/etc do add some weight and they do fail from time to time. Just as an aside, condoms acually make great test/emergency bladders for pack straps etc.
Still some room for innovation in the cuban tent with air tube support area as well. Tents are probably a better application for air advantages actually. Still very hard to make it into the ultra-light realm this way since bladders and sleeves and valves weigh more than carbon poles with current tent designs but worth more experimentation since there are "offset" advantages. Not carrying poles is an advantage in some ways as are freestanding tents (no pegs, pitch anywhere, etc.) Perhaps a tent designed around an inflatable floor? Lots of possibilities popping into my head......