The most likley launchtime for PS6 is late 2027.
1.) Sony THEMSELFES said, that the PS5 already is past its first half of its lifecycle. That was about a year ago in february 2024.
https://www.ign.com/articles/ps5-entering-the-latter-stage-of-its-life-cycle-sony-says
2.) Sony in fact said that PS6 will also release when PS5 is still doing fine- what could be a notice of a PS3/PS4 like lifecycle at least for hardware production.
3.) If MS really launches a new Xbox next year, they have no other choice. Also Switch 2 releases this year.
2028 is suicide anything later than that ain't gonna happen. Mark my words!