I think Danny is done for the offseason. The reason the Stephen Jackson trade won't happen now is because he helped Charlotte make the playoffs. If Charlotte isn't going to make the playoffs come trade deadline, such a trade becomes less of a pipedream.
Sheed's contract will have the most value later in the season. That is why Danny will move his contract then and not now. The Celtics need a big 3 for the playoffs, but the playoffs are 82 games away.
Boston is not going to pay 6 or 7 million dollars in combined salary and luxury tax so Sheed can sit at home, just to maintain the possiblity of a trade that might never happen. Ainge is either dealing Sheed for a player or for a trade exception, but he's doing a Sheed deal this offseason or not at all.
Mike
Technically they wouldn't be paying any luxury tax on Sheed. The luxury tax is calculated by the team salary on the last day of the regular season. Meaning contracts that were traded away mid-season would not count against it.
Of course, they would have to pay the luxury tax on the player they trade for, so, it evens out, but they would have had to pay that whether they trade Sheed now, or in February.
Furthermore, I think there is a great chance that Sheed will want a buyout if he is traded, and the C's would have to provide that money as part of the trade. However, I think there is a likelyhood that they may decide (unofficially) to count the money Sheed is making as he is sitting at home towards that buyout. Meaning instead of sending $3 million with Sheed to buy him out if they trade him right now, they can just pay him those 3 million over the first half of the year, and he will agree to retire without a buyout, since he already got his money.
Now, this is all pure speculation, but the C's are clever people, as is Sheed, and I think they can come to an agreement similar to this, if they want to preserve the asset a little longer, until the market opens up more.