The original post is mostly correct; Nolan's approach is restrictive. It requires many of Batman's enemies and allies to be either removed completely or revised beyond recognition. The upside, though, is that it is the approach is extremely well suited to other characters--or, at least, is viable to adapt other characters to with minimal revision. This is an atmosphere that suits characters like Black Mask, the Penguin (though, personally, my interest in the Penguin is zero), or the Riddler. Hell, even Bane would be exciting to see in Nolan's films (though he would require considerable screentime dedicated to his origins, which I imagine Nolan would be adverse to).
The Nolan films should be considered an opportunity to paint those characters in ways that would not be available in a more stylized film. When Nolan is done, then hopefully we'll have another series that presents a Watchmen approach to the mythos, where we can see the sci-fi and fantasy elements of Batman--Mr. Freeze, Clayface, Poison Ivy.
I'm always surprised when people ask "CAN these characters work on film?" Is it really even a question? It's simply a matter of presenting a world they makes sense in. If Iceman, why not Mr. Freeze? If Sandman, why not Clayface? Watchmen has a naked, blue god fighting in Vietnam, and we're wondering if Poison Ivy is too silly for film? Really? These sci-fi and fantasy elements are a part of Batman, in the same way Nolan's favoured urban soldier angle is a part of Batman. We know sci-fi and fantasy work on film, we know sci-fi and fantasy are a part of Batman, so why would a sci-fi and fantasy Batman film not work?
Stylization and fluff do not go hand in hand. Realism and intelligence do not go hand in hand.