I just went through EN wing 1 on LFR. Apart from one wipe on Il'gynoth, the whole thing went fine. I haven't noticed a dramatic change in how resilient my DH is. I'm still tanky AF. Il'gynoth even dropped a titanforged trinket for me (Goblet of Nightmarish Ichor).
Overall, the Veng DH still feels tanky to me, so I'm not abandoning my progress now.