Hmm, the aerials are interesting, definitely -- I'd like to see them do more ground-level comparisons like the ones of the 1st and 17th at Pinehurst #2. Just from those two pics you really get a sense of the impact of the waste areas / restoration (1st hole pic) and of the changes to the greens over the decades (17th).
The biggest change I see aren't the bunkers but the loss of width. Amazing how many courses have just lost their fairways to rough and / or their rough to trees. If this were a disease everyone would be screaming about a pandemic. And even though it's technically a maintenance change, I bet the impact on the architecture of those old courses is every bit as significant as, say, messing with the bunkers. More so, even.
Thanks for sharing this site with us, Alex.