No one is saying that they'll repeat RE 6, but will probably go for an RE 4/5 type game for RE 8 and spin off the FPS mechanics.
Openings:
Resident Evil 5 - 4.9 million first two months (4.4 month 1, 500K month 2)
Resident Evil 6 - 4.9 million first three months (lower sales opening months attributed to critical reception)
Resident Evil 7 - 3.5 million first three months
It's not hard to forecast that RE 7 won't catch up, and Capcom probably isn't the happiest with coming in 500K under plan (though Dead Rising 4 coming in a million plus under planning to the point of not even selling a million probably ensures that franchise is dead). So it wouldn't surprise me if RE 8 was yet another shift.
Honestly this past sales report was generally bad news for Capcom with everything underselling to a degree with one of their biggest franchises, Dead Rising, utterly flopping.
Also, those numbers for RE5 and RE6 are console only versus RE7's consoles+PC.
The PC versions of 5 and 6 hit half a year after the console releases.