Meh - I'm admittedly a bad tank but even I can tank a MSQ dungeon just fine - It's not rocket science.
If queues are bad I'll just go in as WAR (they will have to put up with me occasionally running the wrong way).
For end game stuff the ratio should be easier to deal as it will either be with a static for raids and if ex primals continue like Zurvan where one tank is the preferred meta that should be no problem either.

Most dps I know with multiple 60s will do the same.