What's going to happen is it is going to be taken off of all appstores. If you already have it then you can still use it for some time, but due to it not being on the appstore it will not get its weekly updates. These updates get rid of bugs and reset the servers. Without these updates, the app will slow down, and without bug fixes, the apps security will be lessened so it will be easier to hack into your account. It will still be usable, but it will just be hard to after a few weeks.