There will be no successor to the PlayStation 5, according to some analysts from Citi Securities Japan. The reason is cited to be the long wait between generations and rising costs associated with manufacturing consoles. The analysts speculate that cloud gaming will eventually replace hardware-based consoles.
https://www.notebookcheck.net/Japanese-analysts-speculate-that-the-PlayStation-5-may-be-the-last-of-its-kind.505219.0.html