For lighter duty vehicles, air bags have been around for the luxury marques. Seems like typical life is anywhere between 100k to 200k for the bags. Compressors are a different story, I believe they are using electrically driven units. They don't last as long as engine driven units, but they also don't cycle as much. I also don't know if the factory bags have any hard internal structure to support the vehicle should one go out. Some do and some don't, if they don't, then loss of air would sideline you. Also, air suspension will usually give plenty of notice before actual failure. You will typically see cracking on the rubber or see sand or dirt rubbing away at the air bags. So as long add you are diligent on the inspection of your vehicle, you should catch most issues before they break. It's just the electric air compressor that is an unknown for me.