* Ongoing Success: Pokémon is a massively popular and lucrative franchise. The anime, video games, trading card game, and merchandise all contribute to its ongoing success. Ending the anime would be a significant financial loss for the companies involved.
* Adaptability: Pokémon has proven adaptable over the years. New generations of Pokémon, characters, and storylines keep the series fresh. The anime can continue indefinitely as long as there are new Pokémon to introduce and stories to tell.
* No Planned Ending: There are no official announcements from the creators about a planned end to the anime.
It's very likely that Pokémon will continue to be produced for many years to come. While individual series might conclude (like the current "Journeys" series), the overall Pokémon anime will likely keep going.