It's actually kind of interesting. The early NFL had to deal with exactly the same thing--people financing their team through their normal business activities, and having to occasionally fold up the operation when things got bad. No problem to pick up the team and move it if you thought things would be better in some other city... teams hibernating for a couple of years until they could find some financing...
Of course, the Indian Packing Company team is still in existence, as are the Decatur Staleys, who had to move to Chicago. The rest of the original teams are long gone. The Boston Redskins played their first championship game in New York in 1936 during the process of relocation to DC. The Cleveland Rams have now relocated twice. The Chicago Cardinals have also relocated twice.
In 1934, the St. Louis team only played 3 games, and the Cincinnati team only played 8.
If one can imagine--the Eagles and Steelers had to merge in 1943 because of the war and lack of players.
The point of all of this: When money is tight, entertainment money is tighter.
An additional point: One of the major NFL sponsors, the Anheuser Busch company, was recently bought out by the Europeans. This will no doubt have a dramatic effect on the league revenue.
NFL Historical Standings