Bob, I thought I answered this question the other day, but I guess you didn't like it.
I was not formerly a big fan of making a course extremely hard, but I have come around somewhat to a position closer to that of the USGA. My main difference with them is the implementation, not the goal.
This is why I think it's necessary to take things to the max: for the simple reason that, without going to extremes, the game reverts to a simple matter of aerial drop and stop, "what's my yardage?" golf. This tyle is not just boring to watch for me, I believe it is also not effective in determining a true and worthy champion.
It is really only when things get extreme - bone dry like Shinnecock, firm like TOC or Sandwich, etc. - that you honestly see the best golfers really stop and think about how they are best going to minimize their scores.
It might be somewhat due to the, well, let's say less than effective policies with regard to equipment, as Dave M argues on the other thread. I'd say that's a factor.
But I also think the the simple evolution of the game - better players, better techniques, better knowledge, combined with more forgiving agronomy - has led us to this position.
It might be possible that firm and fast conditions on the right course would be enough. I, for one, think that Oakmont, with it's topography and greens, could defend itself quite well with virtually no rough. But the firm and fast component would have to be Shinnecock hard, so the course would stil be hard, just a different kind of hard.
Does that make any sense to you?