The Road to 160m+ for Nintendo Switch

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Even if the next system isn't BC, 1.5 billion in software should be a lock.
All those millions of Switch owners aren't just going to stop buying games the moment the successor comes out; it will take several years for the bulk of its userbase to upgrade.
There are also still games in the pipeline that will sell significant numbers; Pokémon Legends Z-A, Mario Party Jamboree, Zelda Echoes of Wisdom...