First off, Miller actually can play SS without too much of an issue. He doesn't have the range and whatnot as Gimenez but he makes very few actual errors. 2B or 3B is likely going to be his calling over SS or 1B, but he is a solid fielding player in general. If he was on the Reds, they would gladly play him at SS over anyone they currently have since he doesn't make many mistakes there. If he is put there, I am not scared about him playing the position, but like I said about Johnson, his best position is elsewhere and I want him at his best position if possible.
Miller will not be called up unless it's everyday ABs, so unless we cut Bauers or an injury to Hernandez or JRam we arent calling up Miller. Now if Chang continues to struggle, we might see Clement as the utility guy, but not Miller. He's an everyday player and won't be put on the roster until he has the chance for an everyday spot. I don't think we will see any change until the end of May...