Hope it has a slightly improvement in existing matching system (not for 2v2 arranged)

[Juslas]

Random is not random - matchmaking tries to pair you with similar skilled partner and equally skilled opponent!
Small player pool is the trouble and solution: combining doubles pools makes matchmaking feel worse than it is. Ok, after time limit, anyone goes as partner makes things even more unbalanced! Playing against arranged ranking leaders paired with a fluffy...

Match can last 2 months, I can wait another day or two. If 4 day limit is reached - decline (by server). That's option for arranged teams, too!
If team plays one or two simultaneous matches, they can end up having twenty something games a year. Team can have high ranking with very little experience. Doubles rankings are hardly statistically valid.