On one hand I hear you - I loved the SamandDeanness from the getgo. On another, from the beginning Sam was consistently shown as being blind-sided by his own need for revenge, much like John, and much as it pains me, from a writer's point of view it was inevitable that it will drive them apart. I can only hope that season 5 will have them together again, because I can't see the show working for a season with them apart. And judging by the previews, the row will be epic.