Harrison Barnes hasn't been himself in quite some time now. The man Sean Elliott coined "Mr. 100%" has been anything but for over a month now, and it only seems to be getting worse. Mitch Johnson has resorted to taking him out of end-of-game situations, but it may also be time to take him out of the Spurs' starting lineup and put Jeremy Sochan back in.
It wouldn't do much for the spacing, but you don't want someone too small in that position, so your only other option is Luke Kornet. I wouldn't mind seeing the Silver and Black start games with French Vanilla, but I'd much rather use it as an occasional weapon rather than a staple.