This is such a moving target, or more like a revolving door given that apps are also pulled from the store. In any case, Apple is so far ahead of the pack that their numbers never mattered much.
Who will gather and address any user issues? Have you planned any upgrades and additional developments? It is important to plan this phase before your app hits the App Store so that you can be ready to address any issues immediately. People who are new to development should understand the need to prepare for what may happen after users have begun downloading your app.