well talking with our main tank in the guild, a bear of course, the last thing he told me was the stamina wasnt the king anymore. im guessing he could be fine but yes harder to heal, trinkets would need to be replaced tho, as soon as he gets gear he will get better but at the start it may be a little hard on healers indeed. also gems , enchants , and reforging is prolly something you want to change on his gear , even if he keeps dps gear , he needs glyphs and everything on it.He will be noticeably harder to heal, dodging less than the average bear. It should still be doable though, but it might be harder on the tougher bosses like Cho'gall or Nefarian.