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We could last 10x longer than we have and won't leave an appreciable mark. We aren't even a sliver of strata, and most likely all evidence of that sliver will be eroded away or churned under. I think the argument is that we ought to be detectable outside of our time to be a epoch. We can't be sure that intelligent dinosaurs didn't write software for a few hundred years.
By that definition the Holocene doesn't get an era either. But it does. We aren't even a sliver of strata yet but that's because we're still at the top. The K-T Boundary is a sliver of strata and it marks the end of one era and the beginning of another.