But comics is too small and vulnerable a market to withstand any more shrinkage of readership. The poor sales of this year and rumors of many store closings may have to do with this. 

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In addition we have -

Steve Strange replaced as Sorcerer Supreme by Brother Voodoo

Miles Morales sharing the Spider-Man name with Peter Parker

Iceman revealed as gay 50+ years after his introduction
The shelving of the Fantastic Four

Nadia Van Dyne sharing the Wasp name with Janet Van Dyne

Sam Alexander replacing Rich Rider as Nova

Laura Kinney replaced Logan as Wolverine

A group of time-displaced young X-Men brought into the present time

Moon Girl replaced Moon Boy as partner to Devil Dinosaur

Raz Malhotra replaced Henry Pym as Giant-Man

While a few of these might have been very interesting (such as Brother Voodoo/Doctor Strange), much of it seems to smack of pandering in an attempt to draw a younger audience, and come across as derivative and uninspired (although some like Ms. Marvel and Moon Girl have enjoyed some success selling as trades).  Picking up an unused identity (like Scott Lang, Carol Danvers or Bill Foster) is one thing, replacing a popular character with a different version in order to benefit from their popularity is another.

All-in-all it comes across as a clumsy attempt by Marvel to become more diverse, although it only ended up polarizing many long-time fans in exchange for a few minor successes.

Marvel has plenty of minority characters (the Black Panther, the Falcon, Luke Cage, Blade, the Daughters of the Dragon, Shang-Chi, Storm, Monica Rambeau, etc.) of varying popularity that need to be used more frequently.  And their LGBT characters need to be emphasized in ways other than just for their sexual identity.

Really, does no one have to take responsibility for their actions anymore? Is it always someone else's fault that people do what they do?

Besides, the readers being lost had their day back when there were six Punisher appearances every month, Lobo, Guy Gardner, Deathstroke, and Vigilante books by the truckload, and guns were the solution to everything. They really weren't happy here anymore anyway.

It was never the diversity characters themselves that laid sales low. It was the idea that Marvel threw aside the tried and true, proven sales chart climbers to showcase the newbies at the expense of everything else. This bred resentment towards a fun new group of characters and allowed for easy "talking points" commentaries on how "diversity fails." 

Marvel's been pulling the switcheroo sales ploy for decades now, with characters like War Machine, Thunderstrike, USAgent, the criminal Ant-Man, the Superior Spider-Man, et al. Books like "Civil War" taught them that readers no longer cared about consistent characterization or right and wrong. They felt emboldened to launch a Shooter-style "New Universe" inside the MU itself and sideline the characters upon which their company and its good will with the readers was built. 

It's not that the replacements were diverse necessarily. It was that Marvel left the readers no choice but to accept them as the new status quo or leave. This isn't a failure of multi-racial casting so much as it is a condemnation of sweeping, incautious sea changes editorial had no real reason to expect readers to accept, especially at a time when the originals were enjoyed unprecedented success in theaters. 

I would hope that if Marvel made the same decisions but cast the replacements out of a Republican Congressional Interns photo, the results would not be substantially different. 

DC didn't really do what Marvel did. There are a couple more Earth-born Green Lanterns now -- one Latina, one Arab-American -- but they didn't replace Hal Jordan or Kyle Rayner or Guy Gardner or John Stewart, all of whom are still in the GL Corps.

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Yup!