They wont, too risky, too hard to do. And last I heard most of the development is outsourced to another company, chances are its just going to be a nice facelift and minor changes.
Idgaf personally, RE Village is what matters. They remade RE2 and it was cool, but I still prefer the original game over it. And RE3 while decent failed to deliver. So fuck remaking old games like its the solution to fix the older titles, it just isnt, RE4 is no exception. They might as well just focus on making entirely new games, imo.