Actually only 8 owners on teams in both leagues.
Rangers/Knicks- Cabelvision
Maple Leafs/Raptos – MLSE
Flyers/76ers - Comcast-Spectacor
Devils/Nets – Chambers/Katz
Avalanche/Nuggets – Kroenke
Thrashers/Hawks – New Owner (Formely Time Warner)
Ligthning/Pistons - Davison
Capitals/Wizards - Leonsis/MCI
There are more teams that share the building but when the Mavs play that doesn't effect Hicks' bottomline and vis-a-versa. Most of these owners are billionaires who have other business interests, so I'm expecting that they will be able to hold out longer then ahtletes with a finite career.
NHL Owners:
http://www.forbes.com/free_forbes/2003/1208/094tab.html
NBA Owners:
http://www.forbes.com/home/forbes/2004/0216/064tab.html