Well, yes, but Mark 11 is actually quite compact (similar in footprint to Mark 13). Where Sea Mauler comes out well ahead (I believe) is that it has little or no deck penetration, so it doesn't need a ton of space below decks like the Tartar launchers. A reload magazine would likey be carried but would not need to be immediately below the launcher.
That said, Mk11/13 was considered for Project Sea Hawk. Either possibly could have replaced both Sea Mauler and ASROC (Friedman states that these launchers could be adapted to handle ASROC, though they never actually were). This would also provide an antiship capability through Tartar (and later Harpoon). Bit adding a couple of channels of fire would also add a bunch of weight and expense in a ship that was already going to be very expensive.
Edit:. I don't think it's been mentioned that Project Sea Hawk started as an ASW sensor technology program but ultimately devolved into a fast ASW destroyer. They were looking at a 25-knot sonar search speed, and at least 35 knot top speed, which just wasn't feasible with the technology of the day.