if by 'Plan B' one means another major FA acquisition if the big ones don't come.  John Hollinger writes about this at the ESPN Daily Dime:  http://espn.go.com/nba/dailydime/_/page/dime-freeagency-100701/seller-market  

He makes two major points-

1)  The smartest GMs (of those not in a position to clear a lot of cap space) did their contract extensions last year.  Rondo at $55 mil for 5 years seems bargain-basement compared to what's going on now.

2)  There are now 6 max players headed to teams with 10 max spots.  That means a lot of cap space is left to go begging.  Which means that teams with only 3-5 players on their roster will be under a lot of pressure to lock up some serviceable players at Whole Foods prices, or risk having a lost year and failure of their daring 2010 FA strategy.

I think this makes a lot of sense.  If we strike out with LeBron and Bosh, we're still fairly likely to have to pay the max if we want Boozer or even Lee.  The main advantage the Nets have is one of lowered expectations:  after last year, even a 35-win season could look really good.