I can't say I have ever got bad service from a concierge.
And BTW the service has continued for many years through tick and thin, including the bankruptcy. There is not one shred of evidence that AC wants to eliminate the concierges.
Rather the opposite, what it appears to be happening is that they are cutting on the FF program, while at the very least maintaining service at its current level.
Let's face it, actual (deflated) cost of flying 35k miles today is significantly less than 20 years ago. It's only to be expected that at the low end FF benefits are getting reduced.