Would It Be Too Unrealistic for Pretty Much All of the Major Players to Get a Mostly Happy Ending Eventually?

As it now stands, pretty much all of the significant characters get a more or less happy ending eventually, even if it takes centuries (and/or dying, and/or amnesia), and lots of trauma and angst, for some of them. Is that too unrealistic? I don't want to ruin immersion, but I also don't want to leave anyone without even the smallest scrap of hope to hold on to.