Well your larger point, I think, is that Marvel has a more diverse set of properties on which they can rely to sell both comics and movie tickets -- Spidey, X-Mutants, Avengers as a team, Avengers solo (Cap, Thor... does anyone doubt a Black Widow movie starring Scarlett would put butts in seats?), etc. DC has relied for decades now very heavily one huge mega-property - The Batman, with Superman running a distant second most of the time (except when something extraordinary happens like the "Death of Superman" garbage that for some reason sold like gangbusters). It's not as easy to pinpoint a single property of Marvel's without which the whole company would be hosed, the way you can with DC and Batman. If Marvel sold Spider-Man, sure it would hurt, but they'd still have a ton of fictional artillery left. If DC lost Batman... it would be a much bigger blow. Batman is a much large slice of DC's pie than any one property, even Wolverine, is for Marvel.