When it gets useless and worthless in July.
Asking question: Whats the point of working hard and farming this gear???
It's not worthless, once in 2.0 the only thing better than DP is gonna be Besh Temple, and having decent gear for that will help a lot. We are on 2.7 in NA and I still use a Taha orb+triro merge as my main pve sorc weapon, and the Taha tome is still the best for a MA set.