Gaming philosophy - is video gaming sustainable in a world at peace?

[Reasonable]

There are two plausible (and not exclusive) scenarios (probably more in fact):

1 - a move to classic 'pure' games more like Mario with no realistic violence or conflict or a strong focus on fantasy settings with heavily stylized conflict

2 - acceptance of more violent videogames as an output from aggression, etc. - although in your argument it could be the case that humanity is at a point where there is no need for that output

Either way videogames, books, etc. would do just fine. I suppose, as haxxiy is correct, you could see the strange scenario where violent games become like contraband or even illegal but highly desirable to certain people.