Welp, Jim's digging. That intro was absolutely fantastic, but I feel like there's a fallacy or two involved in the argument itself. I'm not the only one to consider "loneliness" and "being alone" different things; the quote that set Jim off could've been based on an understanding of the word "loneliness" similar to my own. As I (and possibly Ocean Quigley) would define it, loneliness is by definition a bad thing and something one would only want from particular sorts of games, games designed to exploit players' lonely, discontented feelings. Feeling lonely (again, by my understanding of the term) occurs specifically because a person is unhappy about being alone or not being with trusted/familiar people and would not happen (barring disorders such as depression) to one who is completely fine with his or her aloneness, separation, etc. Maybe Jim had no idea that there was another definition floating around, but then again maybe he just intentionally ignored the point to have something to argue with.
As for singleplayer vs. multiplayer, I'd like to see more multiplayer and especially co-op, but only where it belongs. Fthreear's co-op pretty blatantly wrecked the atmosphere of the game, but in Magicka it's hilarious and useful. I'd love to be able to play Skyrim with a friend (if I had friends, at least) and don't see why that should be completely out of the question for such games. In that particular case there is a bit of loneliness which, though maybe intentional, limits it for me. I can have followers, but they're really not that interesting and definitely nothing like as interesting as having a friend along. I also don't see nearly as much of the co-op being crammed into everything as people like to complain about. Maybe I just don't play the right games, but I've got few that are capable of any sort of co-op and even fewer that have what I'd call "co-op" as opposed to something more like "playing on the same team."