I would depend on the real cost. It is possible that Jake or Ava would have provided and adequate substitute vessel for Lucifer. If Sam hadn't been born, then it is unlikely that John would have cheated and Dean would have been about the only vessel around for Michael. John, if still alive, would have been a back up, but if Dean had been raised in a house believing that angels were watching over him AND had never had any reason to be suspicious of angels, he might well have said yes to Michael and the Apocalypse on.
Sam seeing Dean possessed by Michael, half the world dead and who know what other fallout from Dean and another psy kid saying yes to Michael and Lucifer respectively might well make Sam see that his upbringing, his pain, his suffering were the only things that stood between an Apocalyptic battle with Dean being lost in his own body or the relative peace that was obtained by Sam's sacrifice.
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timeasmymeasure
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Date: 2011-10-26 07:32 pm (UTC)Sam seeing Dean possessed by Michael, half the world dead and who know what other fallout from Dean and another psy kid saying yes to Michael and Lucifer respectively might well make Sam see that his upbringing, his pain, his suffering were the only things that stood between an Apocalyptic battle with Dean being lost in his own body or the relative peace that was obtained by Sam's sacrifice.