I already did, simply because an extra anger 5 proc is whatever compared to my full raid's dps. I was crashing zones constantly or simply lagging out due to using too many AOEs. I think my main source of the crash is using IA3 on huge pulls, warrior doing anger 6 / anger 5, 3 zerks, and skin on the warrior. It just added up to being too much combat spam. I still click off IA3 on massive pulls (zerka) just to be safe. Crashing t9 would just make me log for the day. Luckily, I haven't had any issues since I began clicking off IA3 on the Zerka pulls.
I do, however, still run the whip on my bards, ranger, and rogue. The answer to when THEY replace is never. Unless the weapon damage starts to get around 30k or so. I'm guessing we'll be using whips for a few more tiers