Well what you are describing is basically filtering. The only difference is you would get to pick a genre and when you clicked it would open a list of movies in that genre. I think i am not too crazy about the idea of having the same movie listed twice in a single list scrollable list though.I was thinking the more simple way. A movie listed as Drama and Romance, would be in both, genre listings. So as you say, sort of duplicate listings. It's way better than a horror movie ending up as a romance movie etc.
Not listed twice ofc.
If you pick Drama on the list, it looks for all the movies that has "drama" in the genre and list those.
Same with Romance, a entirely new list will pop up with all the movies that has "romance" in the genre
So the movie will only turn up once in each list, and you can ofc only have one list at a time. Just like they do in My Videos, the only difference is they dont have multiple genres