I’ll wait to see your idea fleshed out, but I still worry about double off tank, which is an issue that currently affects every role.
This thread from a Damage player echoes how I feel about it:
I propose 1-1-2-2
Sick of getting 2 Off Tanks on my team after spending long queue times for DPS. This is just QP too… it’s kind of frustrating. When I tank I win… because I usually go Rein or something vital to the team.