netflix-migrate 
A command line utility to export and import your ratings.
Installation
npm install -g netflix-migrate
Usage
netflix-migrate --email old@example.com --profile Lana --export netflixData.json
netflix-migrate --email new@example.com --profile Lana --import netflixData.json
You will be prompted for your email address, password, and/or profile name if not provided as a parameter. If you do not specify a file path for --export or --import, stdout and stdin will be used, respectively. If --export or --import are not provided, --export is assumed (and stdout will be used).
Your exported data will also contain your viewing history. Currently, the import function is only able to import the rating history, but that will hopefully change soon. However, you now already have your data and once the functionality is added you will be able to import your old viewing history too, even if you don't have any access to the old account anymore.
Warning
Use of this software may constitute a breach in the Netflix Terms of Use and/or the End User License Agreement. Use at your own risk.