I think the main point is that a lot of them have stayed with us for so long already. It's not like Lovren throwing his toys out of the pram after one season, the likes of Lallana and Schneiderlin have put in some serious time and were always going to leave at some point. I suppose the question in their minds is why not now?
We've had the spine of the same team for ages in football terms, losing no one over the age of 19 that we didn't want to sell. Unless players are staying here forever, they have to leave at some point. Morgan might stay another year, but it surely won't be any longer than that.