I wouldn't trade for him because the people of San Diego have been questioning his effectiveness for two years. He's had 47 turnovers from 2011-2012 and his game appears to be on the decline. He's never won anything significant and he's 31 years old.
If he were available in free agency, I'd be interested. But as a trade? No.
If he bombs out this season, it'll be his last in San Diego, anyway.