Since your average level 30 THF hits 4-5 enemies about twice per second, I don't think 3 hits over 2-3 seconds even on a dozen mobs is going to be that taxing on the servers.
I haven't noticed any significant reduction in lag since U49, so even if there were enough chains going off to add back half of the procs that were nerfed away, I can't imagine it having a noticeable impact either.