The Green Bay Packers have declined to assign the franchise tag to backup quarterback Matt Flynn, clearing the way for the 4th year pro and backup to Aaron Rodgers to become an unrestricted free agent next week.   Flynn is likely to sign with another team in the hopes of becomming a starting quarterback after starting just two games in his Packer career.  He played well in both, nearly upsetting the New England Patriots on the road in 2010 and setting single game passing yard and touchdown records against the Detroit Lions at Lambeau Field in this year's regular season finale.  If General Manager Ted Thompson had slapped the franchise tag on Flynn, it would have resulted in a 14.4 million dollar contract for the 2012 season.  There was some speculation the Packers would consider applying the tag in a sign and trade deal but the market may not have brought Green Bay a preferred second round draft choice in return.   If a deal could not be reached, the Packers would be on the hook for a huge salary for a backup to the league's MVP, upsetting the team's salary cap structure.  Several teams may still court Flynn as a free agent, among them, the Miami Dolphins and Cleveland Browns.  If Flynn does sign elsewhere, the Packers may be in line for a compensatory draft choice that could be as high as a third rounder pending other free agent depatures.   The league's free agency period begins March 13 and Flynn will join the list that includes center Scott Wells, running back Ryan Grant, defensive back Jarrett Bush, defensive tackle Howard Green, defensive back Pat Lee and linebacker Erik Walden.  Negotiations with Wells, who made his first pro bowl last season, have produced little progress.  Aside from Bush, the Packers aren't expected to agressively try to re-sign any of the free agents.