So very sad, but other than in realms of fairy tales and "happy ever after" land I find it hardly possible, given the characters of the two main players,for the story to have ended much differently. From the beginning and to the exclusion of all else, sweeping aside anything or anybody who stood in his way, David was committed heart and mind to this relationship - her mind, if not her heart, was equally so. They created a world for themselves which negated the need for friends and family. They probably would have been quite unconscious of this while they were both youthful enough to enjoy the delights of hedonistic life, their wealth and status ensuring their place at the centre of their chosen world. However, wealth and status alone only buys "things" and duty, which as a member of the BRF it would have been unnecessary for him to know and Wallis, I believe, didn't feel the need to know.
I find it hard to imagine that they experienced friendships in the way of lesser mortals. I feel it more likely that they had acquaintants, that there remained a respectful line that outsiders crossed at their peril, which would have been fine had there been even one or two insiders, but I suspect that other than WE, there weren't. In fact, their servants probably knew them more intimately than anybody and I believe some of them remained, maybe without wages? almost to the end.
The Bible warns us that "as ye sow, so shall ye reap" - the secular version telling us "what goes around, comes around" but I really don't believe that she deserved to die in those circumstances. We would face imprisonment for keeping an animal alive in those conditions, but the sad truth is, that after David died and she aged, she mattered less to more people and in the end she mattered to nobody, but at least some of the responsibility for this rests with her.