Indirect proof of this: Sony has stopped publishing console sales data in reports. Every such report between 2014 and 2021 had a section on PS4 shipments. Now this section has been removed and replaced with PS5 sales statistics. This is interpreted as Sony is preparing for the end of the PlayStation 4 lifecycle.
Sony plans to release more PS5 consoles this fiscal year than at any other time in PlayStation history. The console maker plans to sell 18 million PlayStation 5s.
Source: Ferra
