We can sort of try to imagine how technology could develop in tens of thousands of years, but… not really.

To some extent, I think we've become blinded by the progress we've made in the last century relative to the progress we made in the millennium before that. For the vast majority of our 10,000 years of human civilization, life was of relatively uniform technological variance. We're in a big uptick of progress in this moment, but eventually (I'd argue very soon) we're going to exhaust the natural limits of our surroundings and the advances of technology will run up against the limits of our material conditions.

Then we very easily could be in a world where the modern day "high tech" nature is the baseline for decades, perhaps even centuries or millennia. Also, very possible we dip into a Dark Age. We've done it before. And its not as though this degree of manufacturing infrastructure is cheap or easy to maintain indefinitely.