Solution/Script to automatically sync Safari's Reading List to Read-it-Later services like Pocket or Evernote?
I had this same idea a few months ago. I came up with a solution that works, using Ruby.

I use this gist to parse the Safari Reading List plist file:
https://gist.github.com/andphe/3232343

Then I use the ruby Pocket gem to add each item to Pocket.

In the end, I went with Pinboard instead of Pocket, and I have a working project up on github that does exactly that, except using Pinboard.

The example code that you'd benefit from is:
https://github.com/prokizzle/pinboard_tools/blob/master/lib/srl_to_pinboard.rb

What you'd ideally do to make it automatic is have Hazel monitor the Safari Reading List plist file for changes, and then run the ruby script if it's recently modified. That way, every item will make it from SRL to your read later service of choice.

Hope that helps.