I don't think Beane is stupid enough to give up a high draft choice for a RB that has missed a million games the past two seasons.
If they ever traded for CMC, there would be no need to have Singletary.
It would be Singletary and a 5th if I was to make the trade. And I think Beane is on the same page as me. If Carolina wants more than that for a glass RB, then the trade NEVER happens.