As much as devs and companies like to claim that games get more complicated and expensive to make, at the end of the day, it's you who set down costs. It's your decisions to spend 400 millions on a game, instead of 'just' 200 or 100. It's your decision to have a vast open world, it's your decision to have state of the art photorealistic graphics (and I love realistic graphics, but even then you can have a cheaper version of realistic that still looks good) and it's your decision to have a marketing budget that is as big as the development cost.
It's all in your hands, so don't come here to me crying that developing games is unsustainable, when it's entirely your decision to have such bloated budgets, all while AA games show you that you can provide a good experience for a lesser price.