Here is a guide of what teams to root for in weeks 15, 16 and 17.
Goals are represented in parenthesis as WC = Wildcard, Div = Division, Drft = Higher draft pick from Carolina.

Playoff Scenario

IF 49ers win out
AND
Cardinals lose 2/3
We win NFC West

OR

IF 49ers win out
AND
Cowboys lose 2/3, Giants lose 1/3 & Falcons lose 1/3
We win Wild-Card spot

Week 15:
Detroit Lions over Arizona Cardinals (Div)
Pittsburgh Steelers over Green Bay Packers (Div) - A loss for GB makes it more likely that they will have to play harder in week 17 vs. Arizona

New Orleans Saints over Dallas Cowboys (WC)
Washington Redskins over New York Giants (WC)
New York Jets over Atlanta Falcons (WC)

Minnesota Vikings over Carolina Panthers (Drft) - Hurt Panther's record
Jacksonville Jaguars over Indianapolis Colts (Drft) - Improve Jaguar's record
Chicago Bears over Baltimore Ravens (Drft) - Improve Bear's record
Oakland Raiders over Denver Broncos (Drft) - Improve Raider's record
Seattle Seahawks over Tampa Bay Buccaneers (Drft) - Improve Seahawk's record
Buffalo Bills over New England Patriots (Drft) - Improve Bill's record

Week 16:
St. Louis Rams over Arizona Cardinals (DIV)

Washington Redskins over Dallas Cowboys (WC)
Carolina Panthers over New York Giants (WC) - This is the one week we want the Panthers to win
Buffalo Bills over Atlanta Falcons (WC/Drft) - This would also improve Bill's record

Tennessee Titans over San Diego Chargers (Drft) - Improve Titan's record
Seattle Seahawks over Green Bay Packers (Drft/Div) - Improve Seahawks record/Pressure Packers
Oakland Raiders over Cleveland Browns (Drft) - Improve Raider's record
Chicago Bears over Minnesota Vikings (Drft) - Improve Bear's record

Week 17:
Green Bay Packers over Arizona Cardinals (Div)

Philadelphia Eagles over Dallas Cowboys (WC)
Minnesota Vikings over New York Giants (WC)
Tampa Bay over Atlanta Falcons (WC) - Hopefully the Falcons will have lost a game by now, in which case rooting for them to improve their record is preferable

New Orleans Saints over Carolina Panthers (Drft) - Hurt Panther's record
Jacksonville Jaguars over Cleveland Browns (Drft) - Improve Jaguar's record
Buffalo Bills over Indianapolis Colts (Drft) - Improve Bill's record
Chicago Bears over Detroit Lions (Drft) - Improve Bear's record
Washington Redskins over San Diego Chargers (Drft) - Improve Redskin's record

And of course, we must win out!