Pat,
Sure it has for them on the courses they play. Are you implying that the same is true for the rest of us.
For bunkers, it would seem, anecdotally, to me that they still hit them with some regularity, fairway or greenside. They've been rendered less of a hazard by the way they're maintained (firm) and by the improved techniques of the players, and I suppose the invention of the sand wedge.
As for the aerial game approach to golf, doesn't that go hand-in-hand with the creation of target golf courses and their use on the PGA Tour. Which came first, lush conditions, as Doug has suggested, target courses with forced carries, or the aerial game based on technology? Maybe American architects are the source of the aerial game by building target courses well before the Pro V1 era. If more tour courses were built and maintained like Scottish links courses there would be more of a ground game on the tour.
Some architectural features built in the past are still effective today - the different types of green complexes for instance - and some are not - position of bunkers off the tee, for instance.
But nobody is debating that the Tour plays a different game today than 50 years ago, or that courses unaltered in the last 50 years can't withstand current pros. Perhaps the Tour should only play at modern "championship" golf courses to ensure that the architectural features aren't vestigal.