If something does happen to the stock market, we’ll all be fucked.

I don’t think that’s true. Even though all the things you mentioned should be diversified, if something terrible effects the markets then there will be bail outs, rate cuts, and/or money printing. What I had in mind though, is that infinite growth is impossible in our finite universe. And there’s no bail out for our planet, yet no one cares that we’re all fucked if it becomes uninhabitable