I yet another time say that your tech tree model doesn’t make sense to me. To get immortality/mind uploading, you need really overpowered tech, far above the level when killing all humans and starting disassemble planet becomes negligibly cheap. So I wouldn’t expect that “existing people would probably die” is going to change much under your model “AIs can be misaligned but killing all humans is too costly”.
I yet another time say that your tech tree model doesn’t make sense to me. To get immortality/mind uploading, you need really overpowered tech, far above the level when killing all humans and starting disassemble planet becomes negligibly cheap. So I wouldn’t expect that “existing people would probably die” is going to change much under your model “AIs can be misaligned but killing all humans is too costly”.