Please note that I wrote "Science Fiction", not "SciFi" or Fantasy (although I'd like to see a really good adaptation of Lovecraft).
I'll throw out a few to start.
1. Anne McCaffery's "Dragonriders". Some co-workers played with this back in the '80s (one of us was a dead ringer for Lessa) and decided it could only be done with animation. Now it would be possible with CGI and live actors.
2. S.M. Stirling's "Nantucket Trilogy". could be as easily shot as "Master and Commander" was.
I have more, but what do the rest of you think?

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"Everybody's playing the Game
But nobody's rules are the same
Nobody's on nobody's side." (Tim Rice)
No matter how strong, or brave, or pure of heart you may be; sometimes the dragon wins!