I guess theres two types of players from what i read in comments. Those that put themselves in the role of the MC like an RPG so take everytrhing that happens personally and heavily invest in the ingame relationships and those that treat it like a film/book so they just want to see a certain type of adventure without the attachment.
Myself personally for example think all the girls are hot and want to see them in as many different situations as possible, Romantic, NTR, Harem, Gangbanged, you name it, its all hot becasue i have no attacment to them what so ever. Its just a fun type of media to explore different fantasies and when the story finishes ill find another and i do and many others do i expect like that the girls are corrupted and others try to take advantage, Its not real life so its fun to explore.
To answer your question i dont think the story will be repeated but the themes and direction that characters take will and why? Because thats is the genre that the creator has experience and interest in. Say if he was to write non ntr harem it most likely wouldnt work or last because his interest would decline. He creates what excites him and hopes others enjoy it or im sure he would of named himself h4rem instead of t4boo