While Silent Hill did do well, it's only got a single game out and therefore might not have the name value Resident Evil has. However, Capcom is only just now opening properties for film (Marvel properties, but properties nonetheless) and may need some convincing. Plus, horror is not a genre that gaming movies has broken into yet. The Mario movies were family romps of various flavors, Zelda was a sword-and-sorcery fantasy, Double Dragon, Street Fighter and Mortal Kombat were all martial arts action, Rampage was a kaiju tokusatsu piece, Star Fox is a space opera, Contra is macho American action and Sonic & Crash are currently running the realms of 2D and 3D animation.
So, we need a smaller horror game franchise to open the doors for Capcom, to show them that a survival horror game can translate to the silver screen. After all, Resident Evil became more influenced by Paul Anderson's films as time went on, so something to ground it back in the horror roots would be a big help.... and I think I know the franchise to pick.