Will the Nintendo Switch overtake the PS4 in terms of sales worldwide?

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No. I expect Nintendo to release the successor for the Switch as soon as holiday 2022 with better tech and pushing an even bigger library, with full retrocompatibilty, following the current success and outselling both Xbox Series X and PS5.

Of course, that if they continue with the same ideas behind the Switch: hybrid affordable console with a big and diverse library from indies, third and first party titles, plus a very good marketing machine behind it.