Rollerball (1975) James Caan in a future where war does not exist, Bob Peak art

Rollerball, the 1975 English dystopian future roller skating science fiction (sci-fi) sports thriller ("In the not too distant future, wars will no longer exist. But there will be Rollerball."; "In the very near future, they will produce a war every week during prime time... And televise it to the rest of the world. They will call it Rollerball"; note that this film was set in the then distant future of 2018!)