Are they doable as a healer. Or go offspec DPS or GTFO ?
I did this currently on DPS offspec on both my healers. But at present I have the offspec gear to support this. But as we go deeper and as my DPS gears falls behind (trinkets etc for Nyalotha), my healing gear will always be superior.
So, if healers have to go DPS for this, unless they maintain a good DPS set, they will go behind in cloak level of DPS mains who actually gear for DPS.