Niall,
Putting up TOC is a real straw man type of argument against most courses having tee options for all (or at least for the average among the 6-7 distinct groups of tee shot lengths, and shorter hitters in that group will still struggle, longer hitters in that group will have an advantage) If there are 35,000 courses worldwide, there is certainly room to leave historic courses alone, let alone the most historic of all. And, Forrest may have a better guess, but I suspect there probably aren't 350 to 700 courses worldwide with a tee set up catering to 180 and 150 hitters that let them reach all greens in regulation with good shots.
So, if you are worried about new fangled architecture ideas just taking over the golf world, you can relax, probably forever, LOL.
Designing holes with interest for all is a challenge worth discussing. A few here have thrown it out as a concept as if architects are somehow delinquent or lazy. My guess again, on behalf of my brethren, is that making something interesting in all LZ's requires some kind of hazard or challenge is placed at various distances. While I agree that the RTJ/Wilson era got to fixated on the LZ for good players from the back tees, golf is still a tough biz. Unless those hazards are natural or a bit of grass bunker/mound/slope shaping, they are probably low value and too expensive to be built.
For that matter, philosophically do we really want to challenge poor players on those 2-4 extra shots between tee and green we create through more length? I think most owners and architects came to the conclusion long ago that they try to create interesting golf for average and up while creating freeway golf for the D players, and maybe C and D players, in the name of the economic interests of the owner and a perceived notion that the D player really doesn't want much blocking his slow but sure progress to the green. We could be wrong, of course, but Owners pay the bills and the subset of gca nerds who think everything could somehow be better do not, LOL.
And, BTW, I think it was MacKenzie who came up with that notion, i.e., minimize bunkers, after the Depression forced him to. The concept of more forward tees advanced after his career, and it could be argued that RTJ/Wilson actually took his philosophy backwards in their work. But honestly, the 1930's Mac work is still pretty much the model for "hard for tigers, easy for hacks" philosophy, using no more than 25-50 bunkers, etc.
As always, just MHO. And, designing holes in consideration of how teeing grounds are laid out is a subject I have been exploring myself. Up to 1,000,003 things to consider in golf course design, LOL.