It depends on how Meta works. We already know that there will be a time-limiting factor on it somewhere. If it's a set duration, then we can't be tanks at all. If it's a constant-drain model, then we can be half-decent offtanks if we have enough generation ability to keep up... and if the boss doesn't have a transition making that impossible.

Eh, let's face it. Tanking, while nice to have, isn't going to happen. Too many limits on it.