My child will hopefully outlive me by several decades. My grand kids certainly could live more that 50 years beyond that. I may never know my great-grandkids,

My child will hopefully outlive me by several decades. My grand kids certainly could live more that 50 years beyond that. I may never know my great-grandkids, but kinda hope they won't get snuffed out arbitrarily. But fundamentally I don't think "after X years, screw humanity" is something I'll buy into.