I have both Sedin's in a multi-cat league and have noticed there value is falling and this might be the best year for me to give them up.
The problem is nobody in my pool really has high value for them, most people in my pool hate the Sedin's.

If I was to put them both on the block, what would you expect to get?
Are the Sedin's even top 10 players in multi-cat roto leagues?

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8-Team Roto Keeper - G, A, SHP, GWG, +/-, PPP. SOG, Hits and Blocks.

if no one values them highly and most of them hate the sedins dont even bother trading them

I wouldn't trade them right now, they still have lots of juice left in the tank.

I bet they will have a strong bounce-back year this season, I'd put them both in the top 10.

I would absolutely trade them if I could get solid younger talent (something inlcluding a Perry, Ryan, Benn, etc.).

From the sounds of it though, there's no chance you'll be able to work out the deal, so it seems you will need to ride them out.

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12 Team H2H Yahoo Dynasty League

G, A, +/-, PIM, PPP, GWG, FOW, HITS -- W, GAA, SV%, SO

3C - Backstrom, Stepan, Roy, Krejci, Bozak
3LW - Neal, Hall, Ladd, JVR
3RW - Horton, Callahan, Pominville, St. Louis, Atkinson
4D - Doughty, Phaneuf, Faulk, Campbell, Schultz
2G - Ward, Dubnyk

Farm - Anders Lindback, Mikhail Grigorenko, Joe Colborne, Charlie Coyle, Jakob Silfverberg, Matt Hackett