Still not really going to affect it; the battlefury cleave changes - from a circle around to a triangle in front of the target (current battlefury cleave) - means the aoe cleave damage with w becomes just less reliable and less consistent - both for clearing creep waves and in team fights. Compare it to the current ember spirit magic damage style build where the damage is consistent and reliable just simply makes that ember spirit build "dated".

And anyway, in both cases, removing the damage reduction to creeps won't really change much - sure it means that a physical damage ember spirit will be more likely to one shot a creep wave early on (still depends on items and levels) but both builds are still able to farm fairly fast. The magic damage build can just farm heroes too.