Think a Prot Pally can handle it? I'd love to try.
Would speed up the fight quite much if you go one tank and two healers.
We just play it safe and go dual tank dual healers, works fine.
I think on premonitions first kill of heroic 25 Xav (their warrior tank) solo tanked it for the last 5 minutes or so. Def doable on normal, although the only time I tried it on heroic (other tank died and no brez available) I didnt last very long (maybe a minute and a half?).