Why do so many not seem to understand that, in most cases, Netflix is likely not "dropping" anything? Netflix does not own the rights to the content and the owners can decide on the terms of the agreement on how long the content will be on Netflix.
People threatening to leave, or actually leaving, lowers Netflix's leverage to try to get and keep the content in their system.
This is why Netflix is creating their own content and bringing in content that's not normally within your area. So they can keep it up longer and have more control over their own destiny.