TPMS sensor corrosion

My 2008 Passion suddenly lost air pressure in the front left tire this morning at 100 kph. I safely made the shoulder of the highway. On inspection I found the entire valve missing. Smart move got me back to the dealership (prompt service, kudos!) where it was determined that all 4 sesors have to be replaced, but at my cost, out of warranty at 104,000 kilometers. While waiting I noticed the new 2011 Smart Passion has a different sensor all rubber! Those of you with alloy wheels watch for splits in the silver plastic nuts, first sign of corrosion on the valve body. This has the making of a safety recall, I was lucky to be on a straight dry road with light traffic and have the training to know how to handle sudden tire loss. It could have been much worse.