And while he doesn't have extensive horror experience himself, Kojima is friends with people who do. Namely Grasshopper Manufacture.
Moreso than that, he's already on development-buddy terms with them. He's already working with the studio on a radio-play prequel to his own early game, Snatcher, and has another, fully game-shaped Grasshopper collaboration currently in development.
So why are Grasshopper so important? Simple: whatever the failings of this year's Lollipop Chainsaw, studio head Goichi 'Suda51' Suda seriously knows how to do surreally-disturbing artistic horror, having directed the sublimely Lynchian brainsmash Killer7 back in 2005. And in 2010, he hired Akira Yamaoka. Akira Yamaoka is the most important person in Silent Hill history, having produced the series during its glory days and composed every soundtrack right up to 2009's Silent Hill: Homecoming. If our orphan has a long-lost biological father, it's Akira Yamaoka.
Given Kojima's success as a producer for external teams (see Castlevania: Lords Of Shadow for evidence of that - developer Mercury Steam's previous game was the rather wretched Clive Barker's Jericho), the idea of a Kojima-produced Silent Hill developed by Yamaoka and Suda51 is pretty much the perfect vision of a reboot for the series. Kojima's status and reputation could cement real triple-A quality for the Silent Hill franchise for the first time in years, while the Yamaoka/Suda51 dream team handle the creative heavy lifting.
If Kojima's desire for a Fox Engine Silent Hill game also means that he's eager to bring Silent Hill back to Japanese development after so long in the international wilderness, there's only one sensible way to do that. After so many years of disappointment, this could make us forget about the entire last decade of (entirely the wrong kind of) Silent Hill pain overnight. Persuasive post cards to H. Kojima, Konami Street, Japan, forthwith, if you'd be so kind.