yeah the change to BW and Avatar make sense, I'd say keeping those is logical.
1) You can CC the hunter, have been able to since Cata
2) Without the hunter, BW damage plummets, significantly
That right there shows why this nerf isn't really needed. It won't change much other than destroy the entire point of the pet CC immunity which is as follows:
1) The spec is overtly dependent on the pet (compared to even other pet specs)
2) Every 50 seconds out of 60, assuming maximum up time, which over 80% of the time assuming you use the ability on cooldown, even more so if you use it strategically, you as a player are subject to 2x the amount of CC impacting your output. What I refer to is not just having two targets for the opposing side to CC, but the opposing side have two sets of DR to burn through in order to negate over half your damage, and several key pieces of utility.
Bestial Wrath, gave you 10 seconds where you were only subject to one set of DR effects, just like every other player.
So no, sorry, this does not make sense. This is a knee-jerk reaction to the sudden OP nature of the BM spec, something that hasn't really happened since the beginning of WotLK (which many probably recall what happened then).
The problem with BM was the Stampede bug (emphasis on BUG), and the ability to stack CDs, specifically CDs with up front burst (LR and Rabid, Rabid specifically with BW and Lynx Rush, or with just simple Basic Attacks due to Wild Hunt).
LR, Rabid and even the Mend-pede nerf could probably be fine as they are, after all, from what I have seen, they are simply burst nerfs, with minimal impact on the net impact of the ability. This BW change is just overkill.