I saw a program a while back and its theme was the future used car market.
With the air bag saftey system well past 10yrs from introduction. Many many used cars will be sold with air bag systems well past the intended life spand.
Installing a new system will cost more than what the car is worth. So most people will not update thier system. The big concerns are, will the air bag deploy on impact or will it deploy on its own as you are driving down the road?
On this program they stated many times when the air bag would deploy on its own, which in some cases caused accidents. Some deployed while sitting in the driveway. I think this issue will start getting alot more attention in the next 5 yrs. when the systems are getting even older.

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Stable:
1973 450sl
1978 red diamond ice vette
1975 steel blue convertable vette
2002 steel blue dakota quad.