Thousands are too many, and the Buddha can't tell. We know that there are birth and death in the world. Even if a specific figure is given now, it must be incorrect. Yes, there will be a Buddhism in a world. There is no Buddha in a world, and Buddha only educates and does not manage in one world. The world includes Hanazono Sakura, Zhong You and Daqian, referred to as "Three Thousand Worlds" for short. In other words, the Buddha taught all beings in the world.