In reality, this is done with the handicap system, no? If the pros had handicaps, they would undoubtedly be plus players, maybe up to plus 5.
And, just like we tend to think best scoring average on tour is really the average scoring average (huh?
) is really 71.21 last year, right around par. Oddly, it is a bit less before the cut, so again ?
Similarly, the average drive distance is now 295.6 yards, up from 291.3 just a few years ago after being steady awhile, not the 340 yard drives occasionally hit by the top dozen driving distance leaders. There are 63 guys on tour whose drives average under 290. As Notah Begay once told me, 290 drive, 260 3 Wood, and a 550 yard par 5 is certainly not a giveaway for the bottom half of the field!
Average fw being hit is 62.63%.
I could go on, but I don't think too many courses ought to be designed for the top 1% of the top 1% of golfers, nor par altered for that small minority.
As to the idea of relative par, it already exists in their minds. I was at breakfast with a pro at a tournament once, when a competitor and leader said he felt like he had a final round 68 in him. My guy, two strokes back, muttered, "Well, I guess I'll have to shoot an even par 65 to win today."