When looking at the history of comics, and how much money they bring in, it looks like April 1993 was that moment, regardless whether you factor the cost of inflation in or not.
How can that be? John Jackson Miller of Comichron breaks it down in this video.
See the chart at http://www.comichron.com/monthlycomicssales/1993/1993-04.html On the 25th anniversary of the storyline bringing Superman back from the dead, Comichron.com founder John Jackson Miller takes a look back at Diamond Comic Distributors’ sales charts from April 1993. NOTE: A couple of corrections: 99 million was the total number of comics sold in 2016, not 2017.