Why would they do anything right off the bat until they do their own research to determine if there really IS a problem....? Looking at my car as an example, I still have no issues.
I bought the car in May '99, and I believe I received the letter before I was married - so within 2 years of buying the car. I didn't join any class action lawsuit, so I have no idea -- like I said, I still don't know most of the details, only that it's covered for 200,000 miles.