We will be removing -Mentor cooldown from the new generation pool, not from the game itself. Anything other than that would literally take months, and then you'd never get to see those Eagle mounts! (I kid, I kid)
In short, if you already have the -Mentor cooldown legacy, it's not going anywhere. But if you wait to identify your items until after Book 7, -Mentor cooldown will not be showing up.
