I would argue otherwise, most people would die trying to figure out how to make a fire when google doesn't work
. the smaller population would be a benefit. Plus having to figure out in a hurry an alternative food supply when the temperature quickly drops 5 or so degrees. you might get some survival in some of the far isolated areas. But I feel like there would be too many factors, the temperature, the composition of the atmosphere. The massive infrastructure. The fact that Bob your neighbor looks delicious? I think the suitability back then would have been better, there were far less people. they were used to scraping and living off of the land, they had a very simple existance, and they could ride their dinosaurs away from the explosion very quickly.
Also no matter how good a survival desire you have, when there are so many factors happening all at once or in the short term, that becomes a does not matter thing. Your going to be overwhelmed and die and not even John Cusack can say you.