Clearly, the green is the only place where one can dependably defend par, given the ability of the touring pro to bomb the ball out of sight. 7300 yard, par 70 golf courses are reduced to driver/short-iron on the majority of non-par 3 holes because the Andre Stoltz's of the golf world can hit it 335 off the tee. The real question is whether a golf fan will continue to watch that kind of golf on television. Have you noticed that the ninety percent of the tv highlights are of made or missed putts? That's the only real drama left in professional golf.
Now, if one is talking about amateur/club member golf, there is another easy and readily available way to protect against low scores: grow some rough! This is a largely ignored aspect of golf course maintenance, because members complain loudly if they have to hack out of the heather, just to get back to the fairway, but heavy rough is at least a half-shot penalty. If a traditional country club were to keep 3 1/2 inch rough and greens at 11 on the Stimpmeter, you would see handicaps and blood pressures skyrocket.
In the end, all I'm saying is that you can only defend par on the tour on the green, but you can torture regular golfers all you want, if the Grounds Superintendant and the Grounds Chairmen don't mind hearing all of the grief.