I suppose I would always welcome a buff, but I don't think we need it.
Just in Bear we got Feral Charge and Bash to control our target's movement, in Cat we now got Maim and in Caster we can Root and Cyclone.
Furthermore, the rare cases where a Druid fights as a Bear will probably not require a slowing skill:
If you're in Bear, it's to benefit from the armor.
If you need armor, it's because your opponent hits with physical damage.
If someone uses physical damage, he's already up in your face.
The rare exception might be Hunter. But then again, Feral Charge usually solves the problem.
So yeah, could be nice, but not overly needed.