Lesson #1: If you're trying to reach out to a new audience it's not a very smart thing to insult them.
He's not reaching out to a new audience; if he were trying that, he'd be making a Wii game.
Personally, the fact that Dyack can't seem to make a game anywhere close to on-time (unless it's already been made. See MGS) is a scathing indictment. What do game developers do? They
make games. They don't spend 8 years making one game. Even StarCraft 2 hasn't been in actual development for that long; Blizzard only started developing it a few years back. And nothing that Dyack makes can stand up to SC2 in terms of game design, so I don't see where the time is going.
I mean, Eternal Darkness was a great game. But did it really need something like 4 years? Twilight Princess didn't take that long to develop, and they had to bootstrap an entirely new control scheme onto it towards the end. And TP is a much larger and more dynamic game than ED.
Dyack is a hack. Maybe a talented one, but he's been making games for 15 years and he's only shipped like 4. And one of those was just a port. In half that time (perhaps less!), Retro Studios will have built a Metroid Prime engine, and shipped 3 games on it, each with steadily improving visual quality to it. And each of similar if not superior quality to anything Dyack has done.
What does that tell you about how much we should care what Dyack thinks?