It is as much of a nightmare to some players as it is a motivation for others; thus, it can ruin a team's chances in that given season, discouraging players with their team—or worse—their career.
Yet, it can also make a team into a special unit, together in the mission of winning a championship in the year that many call their last opportunity.
What makes that season so special is that no one the "a" in "last" to become an "o". In other words you don't want what is already your last opportunity to devastatingly become your lost one as well.
Every year at least one or two teams in the league will have coined the phrase by the end of the summer. It's not so much a criticism as it is fact, hope, or even pity.
This year though, when the power in the NBA has shifted to an extent unparalleled to anything ever seen before, or even in American Sports (I say this because Real Madrid was what Miami is now before Miami was what it is now), more and more teams are facing the dilemma of knowing that this season could easily be their last actual chance.
Some of the teams have faced it before (Boston, San Antonio), and some are new to this criticism (Dallas, New Orleans, Phoenix, Denver).
Either way, these five teams will not surrender this year, and will hope that in their last true chance they don't fail.