Actually I disagree that remarriange is out of the question.
The realisation that the marriage was headed for stormy weather came as Sarah walked up the aisle, and some dreadfully snobish commentator commented that her dress (which I actually liked) was designed and cut to mininize her rather large curves, and that her hair was a rather unfortunate colour, unlike the Princess of Wales! Just as Charles was steady and Andrew was more commonly known as Randy Andy, so Diana epitomised perfection and Fergy was the ugly frump!
I defy any normal woman, not size 00, to remain confident in herself and not descend into a torment of trying to "fit in". Good heavens, if she didn't make enough mistakes herself, her red hair always seemed to be the final inditement. Totally unfair and completely bazaar!
Question: When Andrew and Sarah separated they, unlike very many ordinary let alone celebrity couples, kept it not just civil, but publicly amicable. In those circumstances I believe it must have been a nightmare with the press hounding them for the dirt on each other. Yet every question asked either of them about the other always had the same answer, "he/she is my best friend!
Question: How could Sarah be so sensible of the horrors of a celebrity divorce and the public fallout for Beatrice and Eugeny (sorry about the spelling) and, with Andrew's active particpation manage to pull off one of the most discreet (and amicable) celebrity divorce's ever? Conversely, she managed to supply such incredibley indiscreet photo's to ensure that the public and paparazzi criteria for divorce was more than satisfied?
A perfect "dry run" for another divorce perhaps? with the added bonus of rendering herself utterly beyond the pale, and therefore a lot less newsworthy.
Question: What's with those romantic 'anniversary" dinner's they have been spotted at over the years? They seem to be more "happily divorced" than they were ever allowed to be "happily married".
As for speculation about Charles opinion and future actions, I think he knows that Andrew and Sarah fell on their swords for he and his wife. Further to that, Charles seems happier than ever before since his remarriage. Would he deny his brother the same chance?