The reason that I had wizards ahead of barbs is that in patch 2.6.7 PTR, the top non-season solo barb clear was GR 140. In patch 2.6.7a, ww/rend multipliers were slightly less buffed relative to the PTR version and this build still cleared GR 146 in non-season. Given that wizards in this PTR cleared GR 142, you might imagine that even without changes, the top clears may exceed GR 146.
I am not predicting a wizard buff (if anything they might be brought down a smidgen). I am pretty sure that witch doctors will go live as a weakened version of the PTR and Blizzard already mentioned that crusaders may need an additional tweak to lower their power. Of course, I am not Blizzard so time will tell.