And yet there are a gazillion steel, aluminum and CF bikes out there that have lasted a very long time. There aren't a gazillion, but maybe a bazillion Ti bikes too. But the failures we read about on the forum are the ones that make up our minds. Short of a crash, all the materials will last a long time.

I myself ride a CF Kuota from 2005, an aluminum Trek mtb from 1990 and a steel Davidson from 1981. All are getting old and all are fine.

I should add that the Trek is a bonded aluminum frame, not a welded one, and these were not thought to last. I haven't had any problems using it as my commuter.