I disagree. The transition to highly linear game to completely free open world game is just as big as going from 2D to 3D especially in an age where 2D as a standard just isn't as relevant to people who didn't grow up with it. This will forever be the game that got this series out of Oot's shadow. They've been copying portions of that game for a very long time and now they'll likely be copying this game in some form.
No....hell no.
It's not remotely on the same level, from any angle. There was open world games back then ("Tomb Raider", "OOT"), all any subsequent open world titles did after that is refine the formula.
2D to 3D made everyone completely rethink video games....from fans to developers....people that had been programming games for decades were back to square one. The shift literally ended a few companies, including Sega.
And at "2D as a standard isn't as relevant to people who didn't grow up on it". The historical significance exists totally independent of whether or not people are old enough to care about it. History doesn't get rewritten just because people were born too late to know about it first hand.
The only thing you said that I agree with is this is the game that got the series out of "OOT" shadow....and even then this game uses things (lock on camera) that were started by "OOT". Like I said, all these new games do is refine the formula. Going from "linear open world" to "actual open world" is not as big a leap as this:
Fred.