No question that driver technology has changed over the years. However, I'm talking about Joe Average golfer, not Ben Crenshaw. Joe Average can get a perfectly fine driver for 1/5 the cost of a new Taylor Made and hit it just as well (or poorly.) Just like Tiger can hit my driver way farther than I ever will.
Putter technology has advanced a ton over the years as well. Don't kid yourself. And Joe Average with a properly sized and balanced putter has a better shot at improving his score, in my opinion. Putting is all in your head??? No way. It's all in your hands....feel, speed, stability, repetition.