We better try to snag another good rookie with this year's 1st round pick (16 to 20 - highest pick since long ago)and develop the young guys until KG/PP/Jet retire.
Then, either suck enough to get a lottery pick (this might require trading Rondo) and/or use cap space for trades, absorbing bad contracts and getting lottery picks in the process. This way you don't need to completely suck, and you can get a piece to build, or combine 2 lottery picks to trade up and get a star. It's not very likely that anyone gives you a superstar in his prime for young prospects.
Avoid the Pistons route to use the cap space and everything will fall into place. We just need to be patient, though, and enjoy this team while it's still playing