Feral druid will still be playable , I got 2225 in 3v3 playing a scrub comp with a rogue with still 5x piece lvl 70 gear , I never really played 5s because as sad as it is there is no good DK or hunter on my server so its pointless to even try 5s.
The big nerf is in 2s , we needed some nerf aka survivability nerf in bear is fine because to be honest I was unkillable prettymuch unless we get caugh in a really bad RNG also the removal of shred glyph was fine and I don't really care about the minus 25% crit on FB considering the others stuff they gave us ( aka rend and tear and the buff on savage roar ).
My only problem is ' maim ' nerf , I got deadly glad playing holy pally , feral druid ( yep playing with the OP holy pally, at least I am not a DK
) and all my play style was around maim being a incaps and lasting 7 second full duration.Changing maim completly destroy the playstyle of the comp. This is why I don't think feral druid can still be viable in 2s.
But like I said I am sure feral could still work in 3s and 5s. Maim nerf is still gonna affect 3s but it won't be as bad as 2s.
Btw don't get me wrong I think feral sucks and this why I am resto now xD