But he has been way to agressive this year and his average is still not to bad at .280.
Look, I'll say it as simply as I can: Ryan Theriot has
never derived much of his value from getting on base in ways that don't involve getting hits. Getting on via the walk has never been a complimentary piece to where he gets most of his value: batting average (even in 2006 when he posted a .412 OBP in 159 PA's, he had a .328 AVG).
So then, in order to get that OBP back up to acceptable levels, assuming his batting average stays somewhat constant, he will need to start taking walks at a pace he has
never achieved before. Therefore, to just say "he needs to start taking walks" is completely understating the issue and, really, completely disregarding what he has done his entire career.
So yes, if Theriot starts taking walks at a clip he has never even sniffed before (we're talking the 17.4% walk rate Adam Dunn put up in 2009, or even the 15.4% rate his teammate Fukudome put up in the same year), he will become a valuable piece to the ballclub, but there is no reason whatsoever to believe this probable or even possible given his skill set.