Their primary purpose of providing routes and general information for USA cycle touring has been replaced by online services which are more current and easier to access. Much of which are free and those that charge are very reasonable and far superior. If I were to do a US tour I see no unique value ACA offers or need for their services.
The other services such as tours, swag etc are what is keeping the doors open and the only hope for a future.
Times they are a changing.