https://wccftech.com/fallout-76-support-never-ending/

Being an online-focused game, there may come a time when Fallout 76 will no longer be playable. While Bethesda cannot make any prediction at the moment, they are aiming to support the game for as long as they can.

Speaking with GameSpot, Pete Hines talked about the Fallout 76 servers, saying that they will be up forever. While he cannot make a true prediction, he said that they are aiming to make support for the game be never-ending.