Maybe, but I think this year is an anomaly. Think about the recent "national champs" and almost all of them played great D. Some of them played great O, as well, but defense was really the common denominator, wasn't it? Check these stats out (Total D rank in parentheses)...
2009 Alabama (#2)
2008 Florida (#9)
2007 LSU (#3)
2006 Florida (#6)
2005 Texas (#10)
2004 USC (#6)
2003 LSU (#1) / USC (#30)
2002 Ohio St. (#23)
2001 Miami (#6)
2000 OU (#8)
Arkansas is another one of steve's "defense optional" teams and it's showing. For all the success he's had there the last couple of years, Petrino doesn't really run a classic SEC-type program at Arkie, does he?