I think that the two quickest fixes to preserving some of the integrity of the architecture of classic golf courses for professional tournaments would be -
1. Limit set to 9 clubs;
&
2. Not allow the ball to be teed. Thus the player can only place the ball in the teeing area and can not alter the ground.
I do know players will sometimes hit driver from the deck, but I believe that is a risky shot that may not be worth the risk on most tee shots. This will require either a slightly slower (more controlled) swing speed and/or slightly smaller club head for tee shots.
From my experience many golfers who do not report scores for USGA handicap purposes, or who play in leagues, already do not abide by the full rules of golf (i.e. stroke & distance for lost ball and for OB; preferred lies; loose relief process). They function fine with their agreed upon adjustments to the Rules. These golfers might potentially continue to use tees and their current 14 club sets. Although over time, some may evolve into including these rules changes.
I could see more series golfers having little issue with the reduced set. Although, I expect the “no tee” rule could be difficult for the amateur golfers.
The other issue with a “no tee” rule, is that this may run contrary to the spirit of the most recent Rules of Golf changes. The USGA and R&A were trying to make the rules easier, improve pace of play, and make the Rules less intimidating to the average golfer.
Making the tee shot Harder, appears to run contrary to the spirit of these Rules changes.
Could the “No tee” rule be accepted as a Local Rule similar to the “One Ball” rule that is currently limited to pro and championship golf?
Also, what would be the impact for wear & tear on tee boxes if all use of tees ceased?
Finally, although less then ideal, is this a more plausible fix as opposed to a ball “rollback” or reducing the size of the driver head?