Would be really interesting! I also would really like to see the full civ pool in 1v1 tournaments.
Although partly this idea was already implemented in KotD2 and ECL. As we all agree now, it was not ideal in KotD2, but I think we see some more civs thanks to ECL's civ pools.
For single 1v1 tournaments: Maybe it could be accomplished with more bans? If you are allowed to ban 5 civs from the opponent, obviously we would see more low tier civs.
Although partly this idea was already implemented in KotD2 and ECL. As we all agree now, it was not ideal in KotD2, but I think we see some more civs thanks to ECL's civ pools.
For single 1v1 tournaments: Maybe it could be accomplished with more bans? If you are allowed to ban 5 civs from the opponent, obviously we would see more low tier civs.