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Yup... How many people don't even know about ARAM because it's buried in the customs lobby? Adding a matchmaker would give it quite a bit more popularity and there are hundreds of lobbys when you sort by ARAM, those are just games waiting to start, not already going. A quick count would have that at about 190 lobbys at 10:50 at night, which isn't even primetime.
Based on queue times for dominion, twisted treeline on the such I'd definitely say ARAM is more popular then all the other game types. Those have matchmakers already too. They continue getting experience and IP after playing for a few hours, they have a first win of the day bonus, and they even get their games recorded which are big pluses, all absent from ARAM.