JO isn't a championship winner. He's a good player but a massive injury risk, and I don't think Kobe would stay even if they got him. They'd probably have to trade Odom or Bynum to get him, which mitigates any real improvement.
From a marketing perspective, I'm sure Stern would love to see him go to the Knicks. Something incorporating Lee, Frye, Francis and his fat expiring contract (in 2 years) and a future pick.
I think the most likely scenarios involve:
Phoenix, as they have Marion (and his big contract), Barbosa and a draft pick to offer. The Suns get the last piece of the puzzle- an unstoppable scorer who commands a double team, freeing up the rest of a very capable supporting cast, and someone with that killer instinct that would have probably got them past the Spurs in that final game. The Lakers get a solid foundation to rebuild around. Plus, imagine the pure comic value of having Kobe and Bell as team mates.
PHX:
Nash
Kobe
Bell
Diaw
Stoudamire
Lakers:
Barbosa
?
Odom
Marion
Bynum
Chicago: They could offer one of their big 3 (Hinrich, Gordon, Deng- preferably Gordon, as Kobe would be a logical replacement) PJ Brown's expiring contract and Nocioni or Sefashola for Kobe. Maybe incorporate Big Ben and his stupid contract and try to get Bynum too. It would resemble the mid 90's Bulls, in a very good way.
Chicago:
Hinrich
Kobe
Deng
Thomas
Wallace/Bynum
Lakers:
Parker
Gordon
Nocioni
Odom
Bynum/Wallace
New Jersey: A sign and trade with Vince Carter and someone like Boone thrown in. Lakers keep bums on seats with a highlight reel player, even though he's only 3/5ths of what Kobe is.
As an outside thought, What if Portland offered either their most prized #1 pick and some contract fodder, or Randolph, Miles and Roy for Kobe and Walton?
Blazers:
Jack
Kobe
Walton
Aldridge
Oden/Durant
Lakers:
Parker
Roy
Odom
Randolph
Bynum
That could help both teams straight away.
Personally, I'd love to see that Phoenix or Chicago scenario.
I've also heard a rumour of Pierce heading to the Lakers... Could Boston be making a play for Kobe?