Return of the King, the movie, already had too much going on in it. Deciding to end Two Towers with Helms Deep meant that a lot of that book had to be moved into Return, and in turn Towers had to be padded (hence stupidity like Aragorn-falls-off-a-cliff).
Adding extra characters to Return would have only made this worse. Especially characters that, at this late stage (an hour into the third movie), don't play a huge role in the main plot. The alternative was a complete restructuring of the second and third movies. Not going to happen either.
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Then one appeared among us, in our own form visible, but greater and more beautiful; and he said that he had come out of pity.
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