My dream game has always been a game that combines the most impressive technologies with open ended gameplay. So like impressive modern graphics and; physics and; Red Faction-like destructible environments and; procedurally generated content. All wrapped in a good-enough gameplay package like an RPG or something.
I realize all these technologies come at great trade-offs, but the dream is a good balance.
It's mostly the destructible environments from Red Faction Guerilla that I'd want in other games.
No Man's Sky has virtually unlimited amount of destructible planets. There's a limit on how deep you can dig into planets, but considering the size of them, you can dig for years in terms of real time. And then building someone hidden inside.