Here's a trade that happened today in a dynasty PPR league (I'm not either owner):
Palmer, Carson CIN QB
Dunn, Warrick ATL RB
for
Simms, Chris TBB QB
Bell, Mike DEN RB
Bell, Tatum DEN RB
Clayton, Michael TBB WR
The owner trading for the Bells was very thin at RB and has no 1st round pick next year (traded).
In another dynasty PPR league in which I do own MBell, the best offer I've received is for (I won't mention a name since the guys in that league read here) a WR that Dodds has projected in the WR20s, but who is on the other side of age 30. Another owner in the league has also shown strong interest in discussions, but has not yet made a specific offer. I told them both I wanted to see the game tonight and take some time to decide.
I suspect MBell's value will be solidified after tonight, not reduced. Since I'm one of those that GregR mentions in his post as being stronger at other positions than at RB (specifically I'm very solid at WR, which is what I'm being offered), I think it's in my best interest to hold rather than sell at this time. If I hold and he is a dud, I got him for nothing and I end up with nothing. If I sell, I get a WR that sits on my bench most of the time and is aging. I also could lose a great opportunity to strengthen my RB corps with a #20-30 RB, or get better trade value for him once/if his starter status becomes more accepted. For my team, it's worth the risk to hold and wait rather than grab the first decent offer I get.