He says dismissively, knowing even in this darkest of dark moments that it's not true. He'll drink now and then he'll pick himself up in a couple of days and go back into the fray. It's difficult here what with his lack of purpose and his complete lack of faith in the Defense Force actually doing anything worthwhile (can't even strike up an alliance to kill time) but he'll think of something. There's no keeping him down for long.
There's something else here though, a spark of curiosity and a memory of a time pre-soul when he and Jack actually got along pretty damn well. They had something going for them then and what with him and Ianto becoming such unlikely comrades, it seems weird to not at least try. What does he honestly have left to lose?