I don't want to put words in anyone's mouth but I for one would be "surprised" if XB was the starting SS in August. Maybe that is part of the argument you are facing from others SFF. Regardless of what XB does in AAA, a place he will surely be this year, why would you risk turning what is currently a team asset, skill and resources at the SS position into a potential weakness? The Sox will want to bring XB to MLB under circumstances other than having to depend on him to succeed when he has never spent any real time in an MLB uni before.
If the Sox season falls apart and there is no longer any consideration for making the post season, then I would think it more of a possibility. If that does not happen though, and the Sox are competing, the FO will be absolutely run out of town on a rail if they take a situation that does not appear to require any manipulation and start manipulating it only to find that XB struggles at the MLB level with practical consequences for him and for the team's 2013 run and no good answers to that sort of situation. Look I am not going to forget the things I posted earlier this year. I am surprised for one thing that so many of the pitching question marks ended up with a check mark in the plus column. So I am surprised that they are here mainly on that score. However now that they are here, and certainly if they are still here by the time frame you are discussing, I expect them to act like it.