... I hate to say it... but a Reboot is about time.
Go back, and Start at RE0, and go from there.
and for the love of god, KEEP IT SURVIVAL HORROR.
If I Want an action game, I'll play left for dead, or dead rising.
Go back Before teh mansion, start at the events of RE 0, with the intent of making it the START of the series.
move from there to Resident Evil, at the Mansion. But to mix it up, Make the story evolve. First playthougth is VERY short. Player picks Jill, or chris ( Yes, Keep the same Characters) .
That story lasts a TOTAL of an hour, ending with their capture by an unknown entity.
Then playthrough with the other ( again, either Jill or chris) culminating in the eventual rescue of the captured party member, and full reveals....
then ANOTHER short playthrough with Barry, so we get his story.
And Fianly.... to keep the action fans happy, a more Actiony Story/ playthougth of different parts of the mansion and facility... As Wesker.
so it goes
Chapter 1 ( Chriss or jill) 1 hour
Chapter 2 ( Jill or Chris) 5-8 hours
Chapter 3 Barry 1-2 hours
Chapter 4 Wesker 5-8 hours