Actually there just weren't that many V8s produced to begin with. I have no statistics to back that up other than personal experience. I bought my 2007 in 2008 - even then a V8 was rare while V6s were all over the place. I kept looking for a few years and saw the same thing.
As Explorer_PL said - as long as you can fix things yourself you are good to go. I will give you this though - I don't know how common this is but it almost gave me a big repair bill. This is on a 100K engine that was well taken care of and I'm still watching it closely. In fact, not long after this someone posted the same problem with basically a trashed cam.
Another noise thread..