Agreed. Especially on Jordan Cronenwerth. RIP.
About the bolded. They'd have to be careful with introducing plot elements that would require meta knowledge, while it's marketing could potentially confuse the critics/audience members into thinking that it's only an action film, and who'll potentially deride the plot because they don't understand it's underlying themes.
Think of the type of criticisms Mission Impossible (1995) had received. (most were deserved)
Also who'd you want as a director of the action choreography?
See, the way of how most of Metal Gear's story is derided into CODEC conversation, kills the opportunity for making a film out of it I think -- That is to say, a film that would feel like it's Metal Gear. Look at Silent Hill. If you're a Silent Hill fan then you'll know what it is that made the games great, especially Silent Hill 2 -- It's all about the subtleties, the atmosphere, symbolism, something you couldn't possibly implement properly into a 1 hour and 30 minutes long film, as Christophe Gans discovered, to his smelly baguette eating cost.
It'll also probably won't fit into the required length a film needs to be for it to be acceptable for cinema viewing -- You get situations like with Von Trier's Nymphomaniac, or Sergio Leone's Once Upon a Time in America -- May he rest in piece. He refused to make another film ever again after they cut out so much of his film. It's a bit of a sad tale.
The choreography? I really liked the choreography done for Equilibrium by Jim Vickers and Kurt Wimmer, despite the movie's critical standing with reviewers, I'd say the film is generally underrated and quite well screwed together in most departments. I don't know if Yuen Wong-Ping would suit the style of Metal Gear, at least the stuff he did on Kill Bill as that actually reminds me of a lot of the scenes that involve Vamp. While some of Metal Gear's fight scenes tips close to over-the-top, it's most of the time quite levelheaded when it's close combat. In fact, you rarely see anything like that in the first Metal Gear Solid outside of gameplay, which makes it hard. But those guys would definitely be ideal choices. I do, however, feel Kojima should go for fresh meat.