Physically and talent-wise, we know Maroney could break out for over 100 yards any game. Mentally, it's just not there for him, he's in a slump.
As a running back, you really can get into those slumps. Back in my high school days, the same thing happened to me. There was a stretch of about 4 games when I averaged under three yards per carry. As a power back, I kept waiting too long for my hole, going too high, I was just thinking about it too much. When you think about it, you tend to struggle.
After running through the hole high and being knocked on my ass by a 6', 220 pound linebacker, I somehow got back into it. I can't really explain what happened, but it clicked. Over the final three games of my junior season, I ran for 350 yards and five touchdowns, to finish the year at 726 and 8 touchdowns on 4.1 ypc. Ok, back to Maroney.
I think the thing is with him is that he WILL come out of his slump. Mentally, he's just not ready to yet. You see him keep talking about how he needs to get back to what he used to be. He can't. He will never. He just needs to run, and it will come back to him.
I don't think today's game will be his breakout game, Tennessee is really solid against the run, but I do think he will get that game eventually.