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If you mean comics as sequential art, they are doing fine, whether they be webcomics or manga or the various titles marketed toward young readers through Scholastic. That stuff is more readily available than when I was a kid. It's superhero genre comics as a monthly periodical that is struggling, and I'm not convinced that there's any going back to that model. 

Once they figure that out focus on telling good stories with those characters and limited the characters to one book. Stop diluting the brand by spreading it thin.

Remember that continuity is a tool not the be all end all of story telling.   

Don't go "off model"  to tell a story. If the plot doesn't fit the character, don't use that character.  Editors should know this and not greenlight such plot lines no matter how "cool" it might be.