Side tangent: many #FreeBelters seem to take umbrage that Belt does not get to start against LHP, noting that he did well in the minors against LHP. First off, he has barely had more than a year of minor league stats, and all saber observations I've seen would note that no hitter faces enough LHP pitching in a year to make a definitive statement about his ability to hit against them. Still, even if that was true, that puts him in the same situation that Schierholtz has faced in the majors, namely that he has sucked so far against RHP, making his usefulness lessened since the majority of pitchers throw right-handed.
Second of all, there is no indication that Brett Pill isn't a good prospect to do well in the majors. He has hit well in the limited play he has received so far in the majors, something Belt cannot say. He did very well in AAA in 2011. The odds are greatly against him, but the experts have been wrong before. My favorite example of this is Brandon Webb's ascent to ace of the D-backs rotation, as a non-heralded prospect (not one mention of him in his team's pre-season prospect report), while the much more highly touted Baby D-backs all failed to do any thing in the majors. So why not give him opportunities against LHP in a platoon with Belt, who has not been really consistent with his hitting. As Sabean noted in a recent interview with Scott Ostler, the Giants believe in Belt, they want him to be THAT guy for us in the lineup, but so far he has not earned more opportunities. While he's learning, lets see what Pill can do too.