Predict when the global 99% will overthrow the global 1%. Or predict that climate change / nuclear war will exterminate the human species before this occurs. Use evidence. You have 15 minutes.
We are already in a revolutionary period and we don’t know when it will peak. It’s really hard to imagine some sort of communist party takeover of the US state apparatus at this point, but there are a lot of other directions a revolution can go.
I don’t think class struggle will be confined to the history books by the end of the century. I do think there’s a good chance of marked improvements in the right direction though, and some of those will have come directly out of painful insurrectionary moments.