I gotta say, the ending I got was pretty upbeat.
I mean, yes Alt says you will lose your body. But to quote Vic "Your body is just a body, you can patch it up, replace parts, or get a whole new one if you need to" I mean, no the game doesnt hand you a happy ending on a silver platter, but it does give you a hopeful ending... at least mine was. Yea, you wont be safe, you will have to keep finding a cure... but its not impossible. Not in that world.
I mean, in the ending I got, it was massively optimistic if anything.
Alt is just one opinion after all. I dont have to care about what some AI thinks. I mean, she forgot about that part initially, why should she be right, that there is no way to cure it.