I know Riot have a lot to work on and I know they have to stick as close as possible to the live servers (cuz of bugs, errors, etc.)
However, here at the PBE sometimes very few players queue up and play.
My idea would be that Riot should add a little indicator near every type of Q or after you queue up (maybe in a new window message) which shows us, how many players are standing in queue.
Or maybe you could change the colour of the dead queues to red or something else (which can be like green if there are plenty of players, yellow if it is possible to get in game or will be if 1 or 2 players join too and red if you are not even close).
What do you fellow testers think about this?