That's a relief. We got the expanded Persona 5 coming soon. Still gotta get Control.Actually every playstation has lasted around 8-10 years. PS4 still has stuff slated to be released for it well after the PS5's launch so you're going to be getting stuff well into 2021.
Usually a playstation era ends with one last big RPG either from Bandai or Atlus during the launch window of the new console and then there's just shovelware.