Yep, completely agreeable. Just the last bit I struggle with slightly. It is obvious to see he isn't the most gifted. I actually liken him to Navas. They don't do what Silva does, Yaya, Nasri.... but they both give their all. They both perform to the best of their abilities.
I don't understand your last sentence :/ It's a human nature quality. As a fan, to back the trier, to empathize with the (as it were) underdog. I am not saying he isn't replaceable. But I prefer to think, and I hope rightly, that the fans see the value in his utility and his performances.
Incidentally, I don't think Milner is the most popular player. I think it's Zabaleta. But they are similar players. Hence my point about fans backing the workhorse.