Gwent is nearing the last year of support but the game will stay around much longer it seems.
Now, in late 2022, the devs have announced that the end of support for the live service TCG is coming in 2024 as the game will still be fully supported in 2023, albeit by a smaller team of developers.
There will be 72 new card releases across three updates in April, July and September 2023, which should be plenty of new content for the players still actively engaged in the game.
On the other hand, some of the former players might even celebrate the end of active support since many left the game after they could no longer keep up with new content or reworks of the existing decks.
It appears that CD Projekt folks have this in mind as well since they are planning to keep the game going "for years to come", even after the big updates stop.
This wouldn't be the first case where a TCG saw renewed interest from the fans after the updates stopped since all those players that previously left might now come back and enjoy the existing content.
On top of that, the devs are aiming to keep adding minor updates, based on the community feedback so it will still remain fresh but not overbearing.