Many courses have been altered to accomodate advances in technology, even if they do not host prestigious events, and the average handicap isn't a lot different than it was thirty years ago.
Woud courses be altered further and/or designed differently if the average player, i.e the majority, were, say, half a dozen or more shots better?
Tom Doak makes the interesting observation in an interview in the current issue of Golf Australia magazine that short par forus are harder to design because he doesn't want good players to simply smash it onto the green or into greenside bunkers. Would such holes be at threat?