The NBA, IMO, is in a transition phase. The outstanding old talent is on the way out and the mid age 28-32 stars (other than LeBron) don't compare to the prior "generation" and under 27 young talent has yet to make their mark and IMO just isnt there. Also, I just don't see a young transcendent player out there.
Therefore, I believe for the next 3-5 years it'll be a LeBron led team or a team with an oldie + middling star + surround with above avg talent or "teams" with 2-3 of the middling stars that win similarly to the Pistons run.
Old talents, for example, Nowitzki, Duncan, Kobe are in the twilight of their careers.
Mid-age talents, other than Lebron, who really shines? Carmelo, Bosh, Wade, Love. All can't do it without another 2 middling stars.
Young superstars, none have that magic that Kobe and KG had: Harden comes close and he closing in on middle age.
Which leads me to how do the Celtics move forward? I think 2 ways, A) land the next transcendent star in the draft or B) acquire 2-3 mid aged stars that can work together and surround them with avg+ talent.