And creativity is subjective. So, yes, "creative bankruptcy" is a personal opinion. It's not a "narrative." One person's opinion on quality will always differ from another.
I am a Wally fan, so I've dealt with how he's been treated for years now. Them creating an African-American version for the New52 is the least of the issues of what they've done to him. Imposing Wally's characteristics onto Barry because they want a "fun" Flash but still want to use Barry? Erasing him and his family completely post-Flashpoint? Making him a mass murderer? All of these things did more damage than creating a completely separate version of him that co-exists alongside him.
Every character you just listed are from 40+ years ago. The market now isn't the same as it was back then. No market is, be it comics, movies, whatever. What worked then isn't an automatic guarantee to work now.
All of the top selling books being Batman-related states otherwise.