Re: wdired-change-to-wdired-mode needs a key binding in dired-mode

[Richard Stallman]

    Now, what should C-x C-q do in wdired mode? 
    How about this: 

    if not buffer-modified-p
       switch back to dired-mode
    else
       print a warning that the user needs to either save her changes or
       cancel them

I prefer the later suggestion to ask whether to save or cancel them.