Yes, but sooner or later we will also be back on a level, on which we have been a million or more years ago. A collapse of a society with aqueducts or pyramids is not the same as a collapse of a society with 500 or 5000 burning nuclear reactors. 500 or 5000 Fukushima events, but without cooling. An equivalent of 100 Million Hiroshima Bombs will be blown out into the atmosphere.
What you say looks more like some giant asteroid hitting Earth, not like a technological disaster. And still less a societal collapse. Societies usually either slowly vanish into nonexistence without raising hell or just get conquered by their more agile neighbors (which is right, in my opinion)...