Then why are we taking their opinion over our own?
Typically, when people cite something like that, they defer to an expert in that field. In this case, maybe an anthropologist? There's nothing in the training to be a physicist that prepares them to understand the early stages of civilizations forming, let alone is longevity.
There's one other option:
They could make games outside newer versions of the same game. Game studios used to (and many still do) make a game, put it out, then get started making a whole different game. Even with the modern ability to update games,
Put game out
Update game to deal with unforeseen bugs found once the masses have access
Maybe put out 1 DLC if you want
Make a new game now. A different game.