That works on one target per 40 seconds.
While I'd generally agree with your censure here, there is a difference between difficulty and punishment. One doesn't become more okay with the tank dying and a wipe becoming very likely just because rezzing the tank in an AoE fight is then utterly irrelevant in terms of tanking (save for one of n mobs). It's still basically the worst thing that can possibly happen save for healing being both necessary and impossible. Having the tank be an available part of salvaging an AoE fight by more than just his or her added dps isn't the end of the world -- it decreases punishment far, far more than it decreases difficulty.
At present, even with some 20x tank enmity, the loss of enmity-drops and mass-provoke means that they're merely going to be swatting at the remaining enemies while the bash away on the healer, which feels a bit... off.