It turns out Pokemon Bank will be replaced by a new service called Pokemon Home. It wil work with Pokemon Bank, the Switch and your phone.
My only issue with this is that you will need to pay for another service if you want to get your 3DS Pokemon onto the Switch. I hope it's free for those who have a Nintendo Switch online membership event hough it won't happen.
Trainers, we’re working hard to create a future that brings people and Pokémon closer together.
— Pokémon (@Pokemon) May 29, 2019
Bring your Pokémon home to #PokemonHOME in early 2020.
My only issue with this is that you will need to pay for another service if you want to get your 3DS Pokemon onto the Switch. I hope it's free for those who have a Nintendo Switch online membership event hough it won't happen.