Denis Lacorne brings up the Kobe Bryant case, which I have also discussed in a number of conversations with friends over the past few days. I haven't looked up the details, but the case went roughly like this: Bryant had sex with a hotel employee who apparently initially gave her consent but then said no when the sex turned rough (Lacorne doesn't mention this). She charged rape, but the physical evidence was inconclusive. She then declined to testify after some sort of arrangement was made with the accused, who probably agreed to pay her an undisclosed sum and who did make a public apology. He was not convicted.
Could something like this happen in the DSK case? Possibly. Financial compensation might mean more to the victim than vindication in court. It would keep DSK out of jail, but his political career would still be over. But if the physical evidence is damning, he could be convicted even without the victim's testimony, I presume (Mitch, what do you think, as a former prosecutor?).