Though your parallels between 4 and 7, then 5 and 8 provided food for thoughts I'm still inclined to believe 8 will have a bitter ending.And even more parallels:
Resident Evil 4 may seem disconnected from the series, but in fact this game was laying the groundwork for its future.
First, it closed Umbrella, which inevitably affected the situation in the world. Second, it introduced a completely new type of bio-organic threat with a hint of its connection to the Progenitor virus. Third, this game established Albert Wesker's connection with Seashell.
Resident Evil 5 is a direct sequel and at the same time the end of the Resident Evil 4 storyline: Seashell gets developed, the parasite gets modified, and then all this is destroyed against the background of the super secret origin of Umbrella. Wesker dies, too.
Now let's talk about Resident Evil 7 biohazard.
First, Resident Evil 7 biohazard restores Umbrella, which again will definitely affect the situation in the world. Second, this game introduces a new type of bio-organic weapon with a hint of its connection to the Progenitor virus. Third, the game introduces a new crime syndicate and establishes its connection with Albert Wesker.
Resident Evil Village is a direct sequel to Resident Evil 7 biohazard and promises to end its storyline at the same time. The new weapon receives a modification, the syndicate can be developed. Perhaps all this will be destroyed, and against the background of the super secret origin of Umbrella. Maybe Wesker would come back this time. Or will another Wesker die?
Just as Resident Evil 6 told a new story about the Simmons-Carla conflict, so Resident Evil 9 will probably tell a new story.
And then a new cycle.