I'm not so sure you can "cure" the falmer. I mean, wretched and deformed as they may appear to us, they have developed into something new and separate. Whatever they once were is gone, and largely irrelevant.
They are perfectly designed to survive in an environment that most races would consider hostile. They've their own architecture, agriculture, weapons crafts, likely their own distinct dialects. Arts perhaps, and music sung in tones only they can hear with their incredible ears.
They have built a whole culture for themselves in the darkness and ruin the dwarves damned them to. Is their struggle without value? Can you simply sweep that away? Do you think they'd be grateful for it? I think It would be far more interesting to come to terms with them as they are rather than change them to what they were.