Keep in mind according to the patch notes, down ranking a WF on the OH will not reset the WF timer of 3 secs anymore.
So, unless you like your off hand stealing proc chances from your main (which is at a reduced amount due to the mechanics of DW to begin with), its pointless to use WF on OH now.
Only way I can see WF on both hands working again is IF both weapons are @ 3 secs, and I don't know of any 1h weapon that is that slow, that can be used in both hands all the way to endgame. EIther that, or they take back the universal 3 sec proc rate.