They won't be. The newer classics still have a lot of poor people driving them and so they don't date. The older ones so few exists (and most are only used in parades or Sunday drives) and so it isn't worth the bother - it wouldn't make a difference and would make the few people who have them mad.

Unless we see a great push in good public transit such that most people choose not to drive. However that won't happen: Republicans hate transit, and Democrats like transit for non-transportation reasons.