I am not looking to start a debate over Koivu's worth, but in the course of restocking the Capitals' prospect pool, and in his NHL-level trades, of the last two years, George McPhee has systematically turned over the more skilled tranche of Caps forwards and replaced them with younger, bigger and more physical specimens, culled chiefly from the WHL ranks.
Add the fact that he makes more money than any Capital will be making for a while, and there's little chance Saku Koivu is the sort of player for whom McPhee would trade. He is not looking to add a small center, regardless of his skill level. He does not meet the style of play that McPhee would prefer to see his team play once the kids develop.
When/if the Caps trade Witt, Carter, Grier, it will be for promising prospects and/or high draft picks, not established players approaching 30 years of age who are making a pretty penny. If somehow NHL players do come back, they will probably be defensemen.
EDIT: The Capitals cannot absorb the Brisebois salary either. Together, those two players make what... $8M, $9M a year? Impossible trade for the Caps. Looks like $4.25M for Koivu and $4M for Brisebois. No chance in Hades the Caps take on that money. In case you had not noticed, the Caps have gone from a $50M team to a $25M team since mid-January, and they intend to keep it that way.
You must be a Caps fan because MOntreal gets hosed big time in this deal.
Brisenois has been very good in his new role this year (4th - 5th D-Man) and Koivu has been Montreal's heart and soul for many years. Koivu has been playing extreemly well, why would Montreal trade him?