i think you mixed it up
we are only playing 1-2 weeks because there is simply nothing left to do, not because we only want to play 1-2 weeks.
I am still playing elden ring frequently after its launch, and its a god damn single player game…i am still playing a lot of pvp and trying weird builds that can throw people off in pvp.
d4 season is short because of the lack of content, not because player base dont want to keep playing, theres a pretty stark difference