Say what you want about 2003, but the Spurs eliminated the Lakers AND went all the way - a true dethroning. If they were unmotivated, why was Kobe crying, Derek Fisher too? We remember their faces after that elimination. By the way, if a team supposedly is "unmotivated", why even play in the playoffs? Stop making excuses. LA has been dead since 2003.
The 2004 Lakers team should have been the NBA Champions with the lineup they had. You probably won't ever see a lineup with that kind of caliber again - 4 NBA Hall of Famers, 2 who took drastic pay cuts. But by the team they reached the Finals, they felt the championship was owed to them and stopped playing.
It doesn't matter who's "supposed" to win - You still have to go out and play (Dallas, take note.)