The latest patch notes state:
Protector of the Pack: No longer changes value based on party size.Cool! Now I can have my pre-Wrath dual-purpose, one tree spec back! This could either be a correction back to the mean of the last expansion and original game or perhaps a rethinking of switchable talent trees that Blizzard has hinted at in the past. Either way, I can now solo elites at a ridiculously slow pace, tank instances with minor modification to my talent tree (I'm not too impressed with Infected Wounds) and AOE to my heart's content old world rep or lowbie Northrend mobs.
I for one am glad for this.