TheBoost said:

Are you referring to the Scouring of the Shire? That would have added 20 minutes easily (and more like 40 to do it anything resembling justice) to a movie that already went on 20 minutes past the defeat of the main antagonist.

Yes, that's what I'm referring too.

... With a little reflection (almost) all is possible.

May I push the question further: What makes a piece of Art ? Suggestion, or demonstration ? Pick one...

I can't keep myself of thinking of the Balrog sequence:

The film shows a brillant FX demonstration, quite impressive and even beautiful.

Now just take sequence from the book: all happens in darkness and you can't give a shape to what is in front of the characters (whom emotions give all the power to the scene) , and most of all: as reader you really piss in your pants ! That all the power of suggestion.

Such a cinema is still feasible (though Hollywood doen't want this) and the scene would have cost ten times less than what they made.