[General Discussion] If technology was no object, what game would you make?

I've always been fascinated with the "massive, so detailed it's natural" world in a game. An adventure/action title similar to games like Deja Vu and such, but with detail and level of interaction on completely new scale.

That's why games like The Nomad Soul and Shenmue were so thrilling when they were still making them. You felt like those sequences and moments you saw screens and videos of were completely incidental, and many other players might never even walk in on them. So much of that "what if I decided to go there?". It was always slightly saddening to be reminded there are only so many characters, sequences and lines of dialogue as the developers can fit. I'd like to see a game like Shenmue, but with detail so plentiful it'd get to be like our world. You'd have appartment buildings and hallways and endless cabinets you COULD search if you really wanted, but most of them wouldn't provide you with anything useful, much less anything at all. It'd get to the point where you stopped playing it like a regular game title, you wouldn't search every nook and cranny and the whole focus would shift.

I suppose a game system and AI that could generate plot points/dialogue/locations dynamically would go well with that, provoding structure and direction, but constantly shifting, and changing along with the experience.

I guess besides the "what if I went there?" style hugely detailed worlds of immense fidelity, I've also been fascinated with good AI, the kind that gives you a proper illusion of a world reacting to you, not just you moving along a set obstacle course. An RPG where your choices are not just selected at dialogue trees, but through everything. Sit by a campfire with friends, decide to walk off on your own, run into guards, the choice of whether to face them or run back to your buddies completely done through your actions, not just "Fight?/Escape?" menu choices. Someone else playing that same scene, never leaving the campfire, never seeing those soldiers. Someone else going in another direction and finding something else. Someone fighting the guards alone, someone running back and having your NPC friends react with genuine surprise at the outburst, all according to incredibly sophisticated AI.

Jam it back in, in the dark.