Personally I think this would screw the NBA. The League already has such a low rate of parity as it is. Put together a super team of two top 5 players and another top 10 or 15 player and the NBA Finals becomes an afterthought.
2010 NBA free agency: Sources: LeBron James leaning toward joining Miami Heat - ESPN
If it does happen it'll be good for the first year or two as the Lakers could still compete with team absurd, but after Phil leaves and Kobe ages the lack of contenders would make the NBA monotonousness.
I thought this was pretty funny though:
"Outwardlycalm (7/8/2010 at 3:05 AM) Report Violation
Lebron will announce that he has decided to play with himself."

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