The other problem is that damage is ramped up in 16-mans. If you made a mistake in 8man that lead you to get hit (by say the cleave of TFB) it was easily livable through. You took maybe 5k damage. In 16man, you take twice the damage, that can be half your life as a dps. So there's more changes for you to get one-shot.
Plus, you don't get double the number of battles rezzes in 16-man. You're still stuck to 1 in a 5-min fight. So chances for someone to die is double, but chances to revive stay the same.
I don't mind the second one, but the increased damage can turn things into nightmares for healers as they have to react a lot faster.
erm, no, in 16 bring 2 operative healers and you have more resses than in 8, for sure. Ever heard of stealth ress? They even reduced the cooldown of "vanish"