This is the single biggest factor that throws off the predictions of which teams will do well in any given upcoming season. If you look back, most NBA championship teams have been relatively injury-free.
If you could pay more money to team doctors and get faster recovery from injuries, or if they had a magic formula to avoid injury in the first place, they would command salaries like players. Unfortunately things don't work that way.
So yes, durability is key for all teams. However, freak injuries happen all the time. It is not well correlated to playing with abandon. For us fans, it is scary to see players throw themselves into the fray but using athleticism is a big part of the NBA game today. I would not take that away from players with the thought to avoid injury.