This was talked about last night on the Feherty special with Craig Stadler and Gary Woodson. Stads said that back in the day 15 guys would be potentials to win any given week whereas now there are 125 guys any given week who could win. He also said that he only had a caddie and Woodson said that he has a caddy, swing coach, mental coach, traveling therapist shared with 8 guys, strength coach, etc. The game is not the same given all the advances already mentioned and that has to be appreciated as those guys paved the way for the current tour to even evolve into what it has today.
It's like anything else, athletes today have more available to them then they did 30 years ago. Even the soccer moms with their personal trainers could knock-out the aerobic moms from Jack's era even if the soccer moms wore the same leg warmers and tacky leotards from that era and had to dance to the oldies with Richard Simmons. Plus they only had two flavors of Gaterade back then, Lemon-lime and Orange...everyone knows that endurance athletes really took off when they brought in the Blue flavor. Gerard Cote, won the Boston Marathon in the 40s with a time of 2:28. Bill Rodgers won with a 2:09 in the late 70s, then in 2011, Mutai blistered the course in 2:03:02 for the fastest marathon ever. All because of advancements in how far athletic training, recovery, etc. has come, addition of prize money, etc. Cote in his prime would now be considered a local elite, but then again they didn't even have Gatorade back then!