I disagree. The Anchor was just a tool. A very important tool, but still just a tool. It was not the Anchor that saved the Mages or the Templars. It was not the Anchor that stopped the false Calling the Wardens were experiencing. It was not the Anchor that ended the Orlesian Civil War. It was not the Anchor that stopped Hakkon. And it was not the Anchor that stopped the Dragon's Breath. It was the Inquisitor. Thoughout our journey, the Inquisitor became one of the most important and special people in Thedas, having done things nobody has done before and having shaped the entire continent.
What we have here are a dozen people that didn't pay a lot of attention during the game:
How did the Inquisitor get into a position to deal with the mages/Templars? Oh yeah, the anchor. W/out it, you'd have been dead.
How, exactly, did you get into the Fade to deal with the demon? Oh yeah, the anchor opened a rift...
How, exactly, did the Inquisitor get the influence needed to even be at the ball? Also, see the first of these breakdown statements. I really have to laugh at "not the anchor that stopped the Dragon's Breath". By the time you got to the end, you were either spamming the new abilities, or the Anchor was doing it on it's own.
So, in short, w/out the Anchor, the Inquisitor would have been nobody. W/out it, the Inquisitor wouldn't have survived the initial explosion, and if they did, they wouldn't have survived Cassandra in the jail. The anchor, and the "theory" that it would close the rifts was the only reason Leliana stopped her from killing the Inquisitor.