I would find a conflicted Anakin ghost distasteful, as it would severely undermine the ending of ROTJ, which has always been one of my favorite things about SW.
JEDIT: Dom, you make a fair point about the realism, but I do like it a great deal for the archetypical value. It’s more about Luke at that point than Anakin per se. I suppose it’s one of many things that pervade SW with more symbolic value than realistic or intricate.