Again, it's a crapshoot. You have to get a high draft pick that gives you a likely franchise player. You have to be very bad or extremely lucky to draft that high, and you have to be both in order to get a true superstar with the pick.
But that's what it takes.
You not only have to win the lottery but you have to win the lottery in the year that a franchise player is available and hope that the player pans out and doesn't get a major injury. I really think that this is the last resort way to go.
As has already been said in this thread the only way to get really good in this league is to first get really bad, unless you're a prime FA destination (i.e. LA, NY, or MIA).
We're not a prime FA destination, so that kind of narrows it down to rebuilding through the draft. Obviously there's no guarantee it will work, but it's our only option.
Examples:
LA - drafted Kobe (franchise player) and built around him.
MIA - drafted Wade (franchise player) and built around him.
Mavs - drafted Dirk (franchise player) and built around him.
Bulls - drafted Rose (franchise player) and built around him.
OKC - drafted Durant and Westbrook (franchise players).
Spurs - drafted 3 superstars (Duncan, Ginobili, Parker).
Boston? Sorry, but I think we've figured out that Rondo isn't a franchise player. Too inconsistent, and too many holes in his game. You can't in your right mind compare him to a Kobe, Wade, Dirk, Durant, Duncan, or hell, even Rose at this point. So it's back to the drawing board (aka draft).
And obviously that's never a guarantee. Cleveland got Lebron and then failed to get him a proper supporting cast. New Orleans got Chris Paul and then failed to get him a proper supporting cast. The Magic got Dwight and still haven't gotten him a proper supporting cast.
So while it's easier said than done, the blueprint has been laid out and confirmed: draft a superstar and build a team around him, or if you're lucky with your picks, draft a couple of superstars and your work is pretty much done.
The key is that you start by getting a superstar, so unless we pull off a crazy trade for Chris Paul or Dwight Howard, we need to start thinking about how we're gonna get the highest draft pick possible.