To me, KG seems like the type of guy who's in it for the fight, and with the guys who brought him to the dance.
I don't think he'll come back to a team without Pierce and unless he thinks the team being put together is at least quite competitive.
Otherwise, he could just go play for any contender tomorrow and take a legit shot at a ring - which is where I think a competitor like KG should be - in the hunt or out of the game...
Therefore, bring back Pierce, and Ray if you can, at the right money. The try to sign an Illyasova or a Humphries, a Hawes or a Kaman, couple solid draft picks...
and either "go for it again" - or don't...
Don't meaning blow it up entirely.
For me personally, I think You give KG, Pierce and Ray one more year - but put some major ammo behind them this time.
Green behind Pierce
Bradley behind Ray if necessary - and Pietrus in the mix or someone else good
Kaman, Hawes, Aaron Gray or some other legit big, as well as Illyasova, Humphries, Landry or some other legit PF in the mix with KG, Bass and JJJ.
Load up and go for it.
Next year may end up being Pierce's last year - there is some option on the final year of his contract I think...