I’ve belonged to the Delta SkyClub (and its forerunner, the Delta Crown Room Club) for close to 40 years. I guarantee you that the changes were noticed—immediately.
There are now some substantial lines to get into the clubs at many of Delta’s hub airports. They probably had to make some changes. Long time members are not pleased.
That said, club membership fees are worth it if you fly a lot (I average 75,000 miles per year on Delta). It now costs an arm and a leg to eat in an airport restaurant (Cleveland airport, which is my new base, does not have a Delta club, and a hamburger, beer and tip at a sit down place in the B concourse in CLE cost me $36. The total annual fee for the SkyClub, including a special AMEX card, is $550. Plus, in the event that there is a storm or other trravel disruption, personnel in the clubs can get you alternate travel arrangements first and fast.
The food sucks ass in the clubs. I’m somewhere over seven million miles now, and I just eat in the terminal. However, if I have to kill three or four hours, I’ll sit in the club.