Bill,
For the longest time, golfers, upon holing out, had to tee off for the next hole, from within one (1) club length of the cup where they just holed out.
It took approximately 100 years to change that rule.
After approximately 100 years that rule was changed to two (2) club lengths
So, for the longest time, well over 100 years, EVERY level of golfer played the EXACT same hole, from the exact same tee.
Then, the area for teeing off was moved off the green of the previous hole to a separate area.
Why you conclude that contracting the teeing area would result in incomplete holes is beyond me.
Why you think that contracting the teeing area would result in an abundance of X's is beyond me.
There was a reason that the ODG's and some of the modern icons in golf course architecture locate the tees for the next hole just a short walk from the prior green.
With the ODG's it was a concession or attachment to the principle that you teed off for the next hole from as close as possible from where you just holed out. Many old courses have one footpad located in close proximity to the prior green.
No one failed to finish holes and no one took X's as a result.
Your "Chicken Little" declaration that the sky will fall if but one tee is employed is nonsense.
The notion that altering a hole from 380 to 420 will result in incomplete holes and an abundance of X's is sheer nonsense.
Golfers are neither that fragile nor that inept.
Many on this site enjoy and champion tees located close to the prior green.
Part of the problem over the last six decades is the disparity in distance that's increased dramatically between the best, average and poor player.
On TV this weekend, a golfer, from the back tee, at 176 or slightly more, in cool temperatures, hit a smooth 8-iron.
60 years ago, I hit my 8-iron 140 routinely, and 150 when needed.
The PGA Tour Pro probably hit his 8-iron 150, 160 when needed.
So the tees for the best, average and poor player were much closer to one another.
It's the explosion in distance that's created lengthening vis a vis extending back tees or relocating back tees.
Very little, if anything, has been done to lengthen the tees for the average and poor golfer over the last six decades.
Since handicaps are essentially irrelevant to PGA Tour golfers, and since a PGA Tour event doesn't come to every local course each week, let's exclude them from the discussion for the time being.
One common tee, where every golfer would play from, would work quite well.
Look at Tom Doak's survey and Tom's personal opinion on overall length.
If everyone played from the same tee markers and the golf course played anywhere from 6,500 to 6,700 how would that result in incomplete holes and innumerable X's ?
Handicapping would be easier, comraderie would improve amongst more diverse sectors of the membership and maintenance cost would go down.
Then, the remaining issue would be reigning in the ball.
It's much simpler, you just have to abandon your rigid concept of multiple tees for every level of golfer.