Seems little doubt that it calls for a new design paradigm, but only for those 50-100 courses that might hold a PGA Tour event or Major. I guess we will see if the current crop of top designers can manage it doing something different. Doak in Houston and Hanse in Frisco, TX seemingly make Texas a testing ground.....Remember Golf's version of the Alamo!" Not quite catchy enough, that slogan needs work.
But seriously, the average course length on the PGA Tour and in collegiate events is still closer to 7200 yards. I'm told that even at 7600, you limit the likely field of winners to 20 or so of the longest hitters, and 7200 allows the lower half of the field to compete.
That Geoff S graphic about how much better they are doing shows examples well past the introduction of the PROV 1, so distance keeps increasing, yes, but we are past the big jump, so there must be another explanation. I think TD is close - a missed tee shot doesn't automatically cost bogey there any more. I think the whole Pete Dye philosophy was that you can't stop birdies, so you better cause a few higher scores through the round.
I have long figured the bifurcation would come by identifying tournament courses, not in the equipment.