I don't think that he's not good anymore, but it isn't an invalid argument to point out that he has dropped off a bit at present. He is out of shape for a top sportsman and anyone saying otherwise is in denial or projecting. I am sure he could be a top player still, but I think it would take some work and time. For what cost?
Playing for us I am sure would give him a boost and some motivation, and if the club and manager feel they can work with him and get him to his best within a decent time frame then I wouldn't say no, but I just cannot see it happening. Then again, if Doug has had too many pints at the Apres-ski, who knows...