That's only lorewise. Think of them as old legendaries, by half of the next expansion's leveling you will outgear it and traits and such will be turned off by the next level cap.
I'm more interested in the speculated/confirmed (they said it in blizzcon, but who knows) about the number rebalance they are planning for 8.0. I personally would love if they returned numbers to vanilla/BC levels, when you were doing 3k~ dps.