I think a big part of it is also the dead weight that accumulates with older technologies. Sometimes it is a person just making a decision for the stability of

I think a big part of it is also the dead weight that accumulates with older technologies. Sometimes it is a person just making a decision for the stability of their household or because they've been at it so long it is all they know. Whatever the cause, as a technology (particularly a language) ages, more and more people that are change adverse remain and those (many times the best and brightest) move on. Not really surprising, but a bit unfortunate for those who remain.