I don't see the problem with immortality at all. Yeah, witnessing my family die would be horrible, but even if I chose to live a normal life, I would likely see them all die anyway. My dad, my mom, grandparents, brother, aunts, uncles, cousins, all of them. Pretty much everyone in my family is far older then me, so being immortal would just let me see cool stuff. Or maybe the destruction of humanity, but still. I feel like the downsides of it are severely outweighed by the upsides.