To actually answer your question. Resto Druids are probably the worst healer for KFC. RShaman is definitely the best, and I think Monk/Priest/Paladin are all about equal.
The reason is that Druids kind of rely on either Ice Block symbiosis or a class that can offheal (Ele Shamans are great for this reason). Druids are very easy to CC, so without Tremor/Ice Block/Offheals they'll fall behind fast and it'll be ugly. Especially with how squishy Hunters are.
Will it work? Of course, nearly every comp will work. Will it be the best thing ever? No. But it's certainly viable past 2k.