Then we are the last generation and nothing matters. Sad, isn't it? I'm trying not to cry.
You know, there's an argument that if your soul/consciousness is occupying a randomly selected body (whatever that means - don't take it too literally) you'd expect to be occupying a body during the time when there are the most human bodies to occupy. 6% of all humans who were ever alive so far are alive right now.
It's not really rigorous because some consciousness has to occupy this body and that consciousness would make the same argument, but it's a weak inkling of an argument that the future probably has less humans than the present.
It doesn't imply we're the last generation. The last generation to live like this maybe, but not the last. It seems somewhat clear that modern society is incompatible with humanity to a degree. I think in the all it means humanity regresses to the mean, the population drastically shrinks and people live much simpler lives.