As always games will cost as much as the budget allows (with a bit of give or take for how good the producers are at sticking to a budget) if publishers give devs larger budgets then they will hire more people and spend more man hours developing games, if publishers give them less money they will spend less. Better tech in the form of tools, engines and hardware can allow devs to make better content faster and raise the sealing on how much and what quality of content that can realistically be used in a game but that doesn't mean budgets have to go up or down.
Games have been getting easier, quicker and cheaper to make since game development began. But budgets have gone up as games have gotten ever bigger and more complex in scope. Next gen will see games with bigger budgets than ever before, there will also be lots of small teams making cheap small games as well.
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