The scrutiny Marvel undergoes right now is a speck when compared to what it'll see as part of Disney.
Most parents (and kids) know Spiderman and Wolverine from the cartoons, which paint a very different image from the comics. And Iron Man and Hulk are known from the movies (again, very different). The comics themselves are sold mostly to the 20+ crowd.
Correct, the comics skew to an older audience than the cartoons. Disney, of course, wants to appeal to late-teen and twentysomething males as much as they want to appeal to tweeners, so why throw away that market? They might want to position a line of youth-friendly comics, but then again Marvel already has that in the form of their Marvel Adventures imprint (Power Pack is still around somehow). Notably, comics do have a rating system that distinguishes the kiddy fare from mature titles. We just tend to forget that because kids can't actually drive out to comic book specialty shops, much less find any titles they can afford with their allowances and paper-route money.
Honestly, to my tastes Marvel could use much more scrutiny than we're likely to see. All this dark stuff is mostly just enervating garbage. When I read in Wolverine comics about a death camp for mutants run by the U.S. government called "Neverland", I wonder who the hell this is supposed to appeal to. The "Saw" and "Hostel" crowd of murder-porn fans, I guess. And then the real kicker: after M-Day, what happens? Do superheroes show up and liberate the victims, avenge the dead, and punish the guilty? Nah, that would be too "Saturday-morning Punisher-meets-Archie", right? Instead, the entire camp's population is exterminated mercilessly and the perpetrators get off scott-free. The Beast eventually shows up and buries the bodies. Good times.
And remember Genosha, the mutant nation? Grant Morrison decided that a whole nation of mutants was too much, so he just had some big sentinel come in and kill 99% of them. Bravo.
See, those are examples of writing storylines that's caused the majority of fans--even diedhard ones like myself--to want to throw in the towel and just give up on comics altogether. Some writer like Mark Millar or Warren Ellis who gets off on writing ugly, nihilistic stories that only appeal to a tiny minority of folks--the 100,000 or so folks left who bother to visit a comics shop.
No more dreary, pessimistic crap like Marvel Zombies and Dark Reign? No more corpse-mound spectacles where we get to see a neverending stream of genocide, death camps, and other atrocities? Comics might actually go back to being fun, exciting, or (daresay) optimistic? Please, bring on this all-powerful amry of tut-tutting watchdog mothers who (supposedly) always manage to bend media companies to their will.
Like the Beatles said, things can only get better...because they couldn't get much worse.