RE5 Should have been an all Ex-STARS members showdown against Wesker.
RE6 duos should have been Chris/Jill, Leon/Claire and Sherry/Ada
RE7 should have had a real protagonist like Grace.
RE8 should have come after RE4R and featured that RE7 protag alongside agent Ashley in the role of Chris in the game.
That's how you send off your OG cast properly while building a new one that isn't completely disconnected.