Given prevailing winds, etc., an attack on Detroit would really be more of an attack on Canada. I'm guessing they wouldn't want to lose Canadian support, so it is unlikely that Detroit would be considered a good target.
Where's the next superbowl?
Glad I live in West Michigan.
At the risk of "tipping off" the enemy:
Future Super Bowl Locations
Super Bowl XLI, South Florida -- Feb. 4, 2007 (CBS)
Super Bowl XLI will be the record-tying (New Orleans) ninth Super Bowl played in the Miami area. Super Bowl XLI will be the fourth Super Bowl played at Dolphins Stadium. The other five Miami Super Bowls were played at the Orange Bowl.
Super Bowl II -- Green Bay 33, Oakland 14
Super Bowl III -- N.Y. Jets 16, Baltimore 7
Super Bowl V -- Baltimore 16, Dallas 13
Super Bowl X -- Pittsburgh 21, Dallas 17
Super Bowl XIII -- Pittsburgh 35, Dallas 31
Super Bowl XXIII -- San Francisco 20, Cincinnati 16
Super Bowl XXIX -- San Francisco 49, San Diego 26
Super Bowl XXXIII -- Denver 34, Atlanta 19
Super Bowl XLII, Glendale, Ariz. -- Feb. 3, 2008 (FOX)
Super Bowl XLII will be played in a new stadium that is currently under construction in Glendale, Ariz. The site of the 2008 Super Bowl was decided at the owners' meetings in Chicago on Oct. 29-30, 2003.
Super Bowl XXX -- Dallas 27, Pittsburgh 17
Super Bowl XLIII, Tampa, Fla. -- Feb. 1, 2009 (NBC)
Super Bowl XLIII will be the fourth Super Bowl in Tampa, and the first one since 2001, when the Baltimore Ravens defeated the New York Giants, 34-7, in Super Bowl XXXV. The first Super Bowl in Tampa was held in 1984, when the Los Angeles Raiders beat the Washington Redskins, 38-9, in Super Bowl XVIII.
Super Bowl XVIII -- L.A. Raiders 38, Washington 9
Super Bowl XXV -- N.Y. Giants 20, Buffalo 19
Super Bowl XXXV -- Baltimore 34, N.Y. Giants 7
Super Bowl XLIV, South Florida -- TBA, 2010 (CBS)
The Super Bowl will return to the Miami area in 2010, when it will surpass New Orleans for the most Super Bowls. It will be the fifth Super Bowl played at Dolphins Stadium.
http://www.superbowl.com/features/futuresites
Super Bowl XLI, South Florida -- Feb. 4, 2007 (CBS)
Super Bowl XLII, Glendale, Ariz. -- Feb. 3, 2008 (FOX)
Super Bowl XLIII, Tampa, Fla. -- Feb. 1, 2009 (NBC)