This would be nothing more then USL's plan "C" for when everything else falls apart.
Indoor Leagues
http://en.wikipedia.org/wiki/Indoor_soccerNorth America 5Canadian Major Indoor Soccer League (Canada)
Major Indoor Soccer League (2009) (United States and Mexico) (formed from former MISL and AISL teams, formerly known as National Indoor Soccer League)
Premier Arena Soccer League (United States semi-pro)
Professional Arena Soccer League (United States, Canada, and Mexico)
*I-League (USL Indoor) (Fall 2011)Europe 2/4 maybeCampeonato Nacional de Liga de Fútbol Indoor (Spain) [1][2]
Leisure Leagues
Masters Football (United Kingdom)
Prostar Leagues Scotland
Former 12American Indoor Soccer League (United States)
Continental Indoor Soccer League (United States and Mexico)
Eastern Indoor Soccer League (United States)
Major Indoor Soccer League (United States and Mexico)
Major Indoor Soccer League (1978 - 1992)
National Professional Soccer League (originally called the American Indoor Soccer Association)
National Soccer League (never played a game; not to be confused with the NISL)
North American Soccer League (indoor and outdoor soccer league)
Super Soccer League 1978 (never play a game)
Southwest Indoor Soccer League (evolved into the outdoor USL)
World Indoor Soccer League (Originally the Premier Soccer Alliance)
Xtreme Soccer League (United States)
* Another example of USL's winning strategy to muck up soccer in America