That is absolutely right, there is a large number of people who are so invested in the game (in time and money) that walking away is a really difficult option. I think though that this is the first time that i have seen so many gone for a long time. New World is pretty damn good and i think that will be around for quite a while as Amazon games will want it to be successful.
Other new games in the pipeline but until the core "never going to leave till i die" group eventually leave the game WoW will make enough money to keep going. Expect more content droughts though.