Merging random 2v2 and 2v2AT during automatch i dunno. Starcarft has that feature and makes finding games shorter to wait.
However what will happen to the ranks? If you win as a random 2v2 player, you get a different rank than if you win as a 2v2 AT player. It kinda defeats the purpose of 2 teams, higher skilled game, facing each other.
Well, right now we have literally no 2on2 AT. Because there are not enough players.
So playing 2on2 is better than not playing 2on2 at all.
The ranks, well just merge them too or whatever people want. After 7 years they aren't that important.