Jeff,
It's the combination of the idea and historical perception of "par" along with the elongation of the driving spectrum that inhibits the concept of but one set of tee markers for all golfers.
If you were playing match play, would par have any significance ?
If golfers played from but one set of tee markers and one golfer was a 2 handicap and the other a 12, why would playing from the same tee alter anything. The higher handicap would get 10 shots. They'd both tee off from the same tee and the mechanics of the handicap system would offset their difference in ability, thus, they'd be playing on an equal footing.
If you viewed the situation, circa 1960, when a 6,800 yard course was long and equipment couldn't produce today's results, why wouldn't anyone be comfortable with the one tee marker system ?
Going back 50 years, the disparity between forward, member and championship tees was minor when compared to today.
"par" is a nobel quest, but, it doesn't have to be the entire focal point of the game, especially at match play, and even at medal play under the one tee marker concept.