For an NBA team to reach anywhere near 72 wins, a lot of things have to happen:
1. Remaining relatively injury free (by far the biggest key to a 72 win season)
2. No suspensions to key players or coaches
3. No stretches of loss of focus.
4. Team chemistry on the court with the new players must develop
5. Team chemistry in the locker room must be a constant
6. No off-the-court issues with key players (not only media hype like Eva Longoria, but, sad to say, even deaths in the family or similar type tragedies could affect play on the court and consequently wins and losses)
7. Players must still be hungry (directed more towards Tony Parker than anyone, with his youth, media romance, and healthy contract, he could be one of those players who may lose focus at some point during the year)