Dave,Advances in technology and materials science also gave us the Ovation guitar.It's a fallacy to assume that newer is necessarily better.
To me, they sound better than almost any other box speaker I have heard. They scale so well with high end systems, its shocking. I think what I heard was the monitor 40 and some smaller model. The bigger one was amazing! Put it this way, I enjoyed the Harbeth room more than any Wilson demo I have ever heard.
Wilsons seem to be made mostly for tone deaf (and high frequency deaf) audio reviewers.