Silmarillion would be difficult -- you'd have to choose specific stories...and if you wanted to do it in chronological order all the way through -- you'd have to be some super-human like PJ. lots of money...etc...
I doubt anyone would even attempt a remake of LOTR for a loooong time. It's already considered a classic. And even if someone tried to make it again it would be critisized and compared to the original movies.
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