I think merging Rank and Unranked queue for the same mode would be a good idea but still keep an Unranked queue for the other mode and alternate.
During a Conquest Ranked season, have the Unranked queue be 2v2/3v3.
During a 2v2/3v3 Ranked season, have the Unranked queue be Conquest.
I also think losing a match should yields less reward than currently to discourage AFKers, etc.