I see no real answer here. GCU can't afford to have their Reviewers go back and review 'old' cards; we already have folks squawking that our new cards sit too long before being approved. And for those of us with purely thousands of cards... well no way can we afford the time to go back through them.
The best I have come up with is, every time I see an order for an older card (and I admit it is more often than is convenient) I go back and check it out. If I feel it needs editing, I do it and HOPE that it is done in time to go out from the printer's house with the corrections made.
This is a sticky mess that only gets stickier every time GCU changes printers... However, it does seem that every time they do change, we get a better printer.
I guess we just need the Shoemaker's Elves...