Age-wise, he still has a chance to play for France once again at the 2024 EURO tournament, but for the next World Cup tournament Benzema's decision is the right one.
Unilaterally, there is an element of disappointment behind Bemzema's decision to retire from the France national team after the 2022 Qatar World Cup. When Benzema was injured during training with the France squad in Qatar, there were reports that the Real Madrid forward still wanted to stay with his friends in the France squad brought by Deschamps, but the coach did not want Benzema to remain in Qatar.
However, this opportunity has been confirmed by Karim Benzema, that he has taken the decision to retire for the French national team, although he still has the chance to play for the latter at EURO 2024 in Germany.
There has been speculation as to the injury Karim Benzema received while training with his teammates in preparation for the Qatar World Cup, as you say Deschamps has no intention of retaining the player, although it is predicted that Karim Benzema will recover in the course of the Qatar World Cup. until the decision taken by Karim Benzema reaped various speculations and led to the disappointment of several parties over the results received by France at the Qatar World Cup.
This could also have a positive effect on other young attacking players. By choosing to retire as a footballer with the France national team, other players such as Chistopher Nkunku, Muani and Thuram.
Another positive effect would be for Benzema to focus on helping Real Madrid win the La Liga title this season.
Currently, Karim Benzema's concentration can be completely given to Real Madrid, both in La Liga and in the Champions League, because they have a much busier schedule in the second half of the season.
While the young players you mentioned, can struggle to prove their quality in the French national team at the EURO Cup which will take place in Germany in 2024, Chistopher Nkunku, Muani and Thuram should really take advantage of this opportunity.