Is it possible to ever have more than 6 players on a team. I think that it could bring more variety to the game. A while ago there was a glitch where you could get infinite bots in a game, so you could have a 6v20 or ever more. The game can handle that, so from that I know that it is technically possible to have more that 12 players in a lobby. And there are a lot of thing you can do with more that 6 people on a team.
For example, you can have a 2-3-2 competitive game mode. It is just like normal competitive, but that with one more dps. This has the option to reduce queue times for the dps player, who now have a longer queue time than the tank and support players. Also this bring a lot of new tactics to the game. There is also an option to have 3-3-3, but maybe that’s a bit too much to ask for, and this will increase the queue time a big amount.