I saw in Hot Rod magazine back in the late 70's several times that they were warning of legislatures wanting to pass bills to get hot rods and old cars off of the road back then. Might not happen entirely in our lifetime, but more has been done in the last 10 years to move in that direction than from the early 2000's back to the late 70's when the articles were written. A lot of manufacturers have also discontinued parts for some engines, like the Slant 6, which I think is equally as popular as the Chevy and Ford 6's. In other countries like Oz and South America, these engines are still real strong, because they haven't been squeezed out of the market by V8's, so they may last considerably longer in those areas.
