The "remnant of the early days of PC gaming" comment is certainly not something I would expect from Carmack.
But the lack of dedicated servers for Rage doesn't really upset me. I was not aware the game was going to have any multiplayer in the first place. As it is its more likely co-op and not competitive, so player hosted will probably be fine. Borderlands doesn't do dedicated servers and I'm having a blast and a half with it. If it was all deathmatch and capture the flag for upwards of 30 people then it wouldn't work out.