They can choose to not support it by not buying it.If a parent doesn't like what they see in Detective Comics #13 (2012), or Detective Comics #327, there's nothing that can be done about it.
Those crossovers and year long story arcs are not keeping comic books accessible to the new readers who might want to read an issue of Superman or Batman but find themselves in the middle of a continuity heavy year long arc, without even a last issue recap. And some peoples budgets are limited, so they can't buy many comics a month to keep up with the crossover storyline. Which is why I suggested that they make the comics new reader friendly again with shorter storylines that last about three-issues at the most as it was for decades in the '30s to the '80s so every issue is a jumping on point for new readers. Denny O'Neil was allowed to go back to short storylines as editor on the Batman titles after the long Knightfall/Knightquest crossover was over. Beginning with the Doug Moench and Kelley Jones run in 1995 and expanded to the entire Batman line of comics by editor Denny O'Neil from 1996 to 1998.Your point has a flaw in it. That's what I'm pointing out. Anyone who feels the need to buy it all, does so because they are a completest. Not because they aren't smart enough to figure it out. And besides, shouldn't we be encouraging people to buy more comics? Like I said earlier, I bought certain comics because of a crossover and thus that title/character gained one more reader.
Even when they had Batman appear in the Spectre's title and the Spectre appear in Batman's title (obviously to try and boost the Spectre's sales), they kept them two separate stories rather than a crossover storyline.
Actually, because of the strong sales, up until 2004 DC kept publishing comic book series based on Bruce Timm's Batman: The Animated Series/The Batman & Robin Adventures/The New Batman Adventures (1992-1999) long after the TV series was over. As the Bruce Timm animated Batman TV series changed titles, the DC comic books based on Bruce Timm's Batman changed titles as well. The Batman Adventures (1992-1995) spun off into The Batman & Robin Adventures (1995-1998) and spun off again into Batman: Gotham Adventures (1998-2003) and then spun back to Batman Adventures (2003-2004). Beyond the regular ongoing series DC even released The Batman Adventures: Mad Love (1994), The Batman Adventures: The Lost Years mini-series (1998) and the Batman: Harley and Ivy mini-series (2004)."Batman: The Animated Series" had a strong following and the comic had strong sales, but DC cancelled the comic.
Comic books with continued poor sales get cancelled. Of course big name writers with a fan following like Grant Morrison and Geoff Johns and big name artists such as Jim Lee and Alex Ross would give any comic book title a temporary boost in sales, until they leave that title, and many of their fans leave with them.A lot of comics aren't top sellers, but are still on the shelves. If the book were written by Johns and Morrison, it would sell.