The friendship thing is something I have put considerable thought into. The short answer is yes (or at least I hope so). We are basically doing the D ourselves with minumim L effort. Although it is painful, I think this says something about are "friendship" chances, as well as the type of R we have right now.
In my current sitch, D and friendship are not compatible, at least in my opinion. The more I know about her life, the more it hurts. Thus, my goal right now is distance with little contact; this goal does not facilitate friendship. However, I still aim to be friendly and positive for the kids. I hope, when coupled with emotional detachment, this approach will allow for friendship down the road.