What we're seeing in the TB video here is players having to rush over and revive fallen comrades, trigger environmental weapons, stack conditions, and defeat an enemy while protecting an NPC at the same time. While avoiding traps and keeping themselves alive. As he's saying, it's total chaos and being aware of what's going on is required of everyone.
Rushing over and reviving: Plenty of that in many MMOs. Not the same mechanically wise, but I acted as a teammate plenty of times by reacting to a situation and giving combat rezzes in many MMO fights.
Triggering environmental weapons: Seen plenty of cases where the environment was used to help you though a fight. Even variations on the theme like the bomb triggers at the last boss in Gnomeregan.
Stack conditions: No, that never happens. I remember raiding in vanilla wow where we had to strategize which debuffs were priority due to the broken limit on the number of bebuffs a mob could have. Stacking of conditions a sign of teamwork? Sure! GW2 unique on this? No!
Defeating an enemy while protecting an NPC? Done plenty of times before. While avoiding traps and keeping yourself alive. Sure.
MMOs up till now might be very formulaic, but they're not all completely static either. There are random elements almost everywhere.
In other words, you can't be a DPS class and spam rotations through the encounters and get out of the fire once in a while. Everyone needs everyone else and no single person can make or break the experience.
Sure looked like thats what was happening for much of TB's video today. I don't know what you saw, but I saw people throwing themselves at a fight until they brute forced their way through it by learning the formula to beat the encounters. You might not have a TANK per se... but you have someone tanking mobs at almost all times. Everyone is looking for visual clues on how to avoid damage. That guy at the end of the TB video. He whirlwinds. Don't stand in the whirlwind. I learned that on the first pull of Battleguard Sartura in AQ Temple. If your definition of teamwork is these people studying the fight, reacting to the events as they happen, adapting strategy to said events, and conquering the event through (possiblyl) repeated deaths and resets. Teamwork's been happening for a long time this way.
In a Diku-based MMO, once you learn the dance steps (move here, pull adds there, move back here, etc.) and meet the gear checks, the only thing standing in your way are the other members of your group getting it wrong. If they screw up, there's nothing you can do. Tank didn't step out of the fire? Wipe. Priest's internet went out? Wipe.
How is this any different than what we saw on that video? The guy playing in the video stood in whirlwind. Dead. He didn't react to other visual clues for big attacks from the boss. Dead. He didn't trigger the spike traps at opportune times, mobs got further into the group than they should have. Dead. When he screws up, he dies. When he doesn't screw up, he doesn't die. When you're a good team mate in any MMO, you're contributing to success. If you're not, you will usually cause failure.
I bet you anything those fights in that video are going to be almost exactly the same when you first do them and when I first do them no matter who you have in your party. I didn't see anything in the video that led me to believe that the fights aren't formulaic in any way and can't be 'beaten' with enough practice as to make it trivial.
I'm not harping on this game, I'm quite excited about it. But as I said earlier, there's a whole lot of hyperbole and hype in the thread as well as some unfair jabs at other products which have helped evolve the genre.
Saying teamwork didn't exist before GuildWars 2 is an idiotic statement and cheapens the honest teamwork which DID take place in plenty of games before now.
In GW2, you not only can step up, you must step up and play as a team.
I had to step up and play as a member of a team to finish content in The Realm way back in 1996. Its not a new concept to MMOs. You're free to your opinion... but opinions can be factually wrong.