I have avoided this thread for quite some time, but for some reason clicked on it this morning.
It seems that 'air bag' garments are being discussed (I jokingly floated that last year). In road motorcycle racing (ie: Moto GP, WSB...) every racer wears them. Everyday JMs can now purchase a variety of vests, jackets, and suits with airbags. Motocross (AMA, MXGP...) racer don't use them because they are restrictive and hot. They are expensive, vest starting around $500, and suits around $2,500 (some are single use, other up to five deployments). Racers still break bones, but then again they are going way faster.
I had the opportunity to try an Alpinestars Tech Air Off Road (rally, desert...) $1,000, and it was considerably heavier than my summer jacket, and a little heavier than my spring/fall jacket. It had low air flow, and this was the tech air version.
Keep in mind, not only do these systems require the air bag itself, they require an inflation canister, and an electronic control system (with batteries).
I can't imagine a racer who eats like a supermodel to keep their weight dangerously low adding a heavy air bag system, that also reduces air flow.
IMO, not happening soon...