Honestly, I see the NBA heading the other way. Kevin Love, Kevin Durant, Derrick Rose, etc. have all stayed on their respective teams (and have the personality that makes me think they wont leave) and are the future of the NBA given how young they are.
One of these is not like the others. K-Love is not even a make-the-playoffs caliber player right now after 4 seasons in the league, even with an at least adequate supporting cast like Barea/Rubio/Beasley/DWilliams (and before you say "but look at how hard the Western Conference is!!" the playoff teams in each conference had virtually identical records this year, and yet I doubt he would've made it even if Rubio stayed healthy.) Even so, he continues to threaten to leave if the team doesn't shape up.
As for the others, Derrick Rose hasn't led his team to a championship appearance and may never be the same again (and even if he stayed healthy, Chicago didn't seem to match up as well against Miami as Boston did.) I am not ready to write off Durant yet, though.