Yeah, and those injuries in the past two years haven't been fatigue related (Joe Johnson - freak accident; Kurt Thomas - stress fracture; Amare - surgery). Now, Nash's deterioration and back problems have been fatigue related in the past 2 years, BUT this is the first summer in a long time that he has dedicated strictly to conditioning and personal training. Like there's no way to tell if this pace will wear the Suns down come April/May, there's no way to tell if Nash not playing soccer or for the Canadian National Team will help him deeper into the playoffs, because theoretically he would need to make it through 2 extra playoff series (WCF win and then the Finals).
Still, I know he has changed his personality this season to a more serious one, and we've seen what he can do when he's pissed (i.e. almost 3 straight triple-doubles against Dallas in 05 WCSF), so maybe his determination can help him grit his teeth and pull out some extra energy. Since he is the team leader, the rest of the guys should feed off his energy and hopefully lead to a better team effort. But again, this thread is just full of a lot of speculation and I'm simply adding to it.