And when will that be?
Rune is still a kid. He will probably take 2 full years to win.
Alcaraz is even younger than him. He is already a beast but he won't be there in every slam.
And sinner himself has lost to Medvedev Tsitsipas Zverev etc in slams.
While I don't think Djokovic will win 30 slams, 26/27 is very much the target and if he is lucky he can win 28 even.