Would tanks be okay if SE swapped the damage between tank and healers?

[Ramiee]

Alternatively, and I know this is a wild proposition that you may find utterly incomprehensible, we stop using DPS as the only metric of worth

Lol, good luck with that, the past 20 years have shown that MMO players will prioritise DPS above everything else. If you could get away with a party of Vipers a lot of people would run that.