I worry that if I had a time machine, I would go 200 years in the future only to find that all computers had been replaced by holographic AI waifus, and that coding had just been replaced with telling the waifus what to do. Nobody remembers how any of it works, the automated factory just keeps spitting out holowaifu hardware and everyone keeps using it because that's how it's always been.

Or, more realistically, I discovery that humanity is gone.