I just wish comics could be more like manga. Like right now anyone could just go grab the latest volume of Naruto and totally understand what's going on with the plot, but if I want to start reading the new Ms Marvel I need to catch up on the past 60 years of stories!
This is false. The "Marvel Now!" stuff is all self contained arcs, designed to be completely understandable to new readers and no book I can think of runs more than 15-30 issues before the plot is wrapped up.
That being said, It looks like the premise of the OP is flawed to begin with. Purely by coincidence I was having a discussion with a friend in the industry, and this came up:
This is taken from here
http://dc1980s.blogspot.com/2013/04/1985-dc-comics-sales-data.html
This is as you can see sales figures for DC's titles for a single month in 1985. The "draw" here is the total print run, the "sale" figures are the ACTUAL sell through.
This is LONG before the advent of the direct seller market, still firmly in the era when comics were sold in grocery stores and 7-11s. edit: looks like Fabian Nicieza (!) chimed in to say this is newstand sales and direct market isn't included- so to be fair you may want to add another 6-10% to the sales total for the direct market at that time. Stand alone comic shops existed but were not common.
The first thing you should notice is that while the total print run for say, that issue of Superman was 256,000,
70% of those issues didn't get sold.. They were returned to the publisher at a loss and simply destroyed.
Yeah, comics were available in a lot more places, but it didn't actually translate into people buying the issues.
In contrast, here is the current estimate of last month's numbers from diamond:
http://www.comichron.com/monthlycomicssales/2016/2016-07.html
"Justice League" is estimated to have sold 209K single issue copies- and you can bet your sweet ass DC didn't have to destroy 700K copies to get sales that high. Also worth considering is that the single issue market isn't the largest revenue driver anymore- Trades and Digital now combine to eclipse it. Neither existed in the mid 80s.
Book format comics or graphic novels, have grown into the largest section of the comics market. Graphic novels generated $415 million in sales in 2013, divided between sales in the comics shop market ($170 million) and general bookstores ($245 million).
http://www.publishersweekly.com/pw/...ic-novels-market-hit-870-million-in-2013.html
Though by how much no one is sure since DC and Marvel generally don't release digital sales numbers.
By any reasonable metric the comic industry is far healthier than it was in 1985 at least, and sales are at or very close to sales of the industry peak, which hit in 1992/1993- though FAR more stable since the big two aren't completely reliant on the speculator/collector market trading comics like baseball cards to hit those numbers.