His death would have devastated Talokan and left them without a leader, but an alliance with Wakanda, a country that’s currently under international pressure to share its Vibranium, would unknowingly make them soldiers in his war against the surface. However, choosing to take the loss sees Namor gaining a powerful ally in Wakanda and shows that he is smart enough to see the potential in that. Though he realized Shuri's Black Panther could have killed him, Namor didn’t have to yield. During the final battle, Shuri is able to lure Namor away from his water power source long enough to defeat him. The truce between Wakanda and Talokan in the Black Panther: Wakanda Forever ending explained by Namor hints at his next moves.

In fact, it is possible that he will remain in his peaceful life in Haiti and that the Wakanda Forever ending will be Toussaint's only appearance in the MCU. However, given that he was raised away from Wakanda for a purpose, it doesn't seem likely ruling is in his future. M'Baku has shown his respect for T'Challa and his family, so it is likely he would not challenge Prince T'Challa.

As a rightful heir, Prince T'Challa may also seek to take the throne now. Though it would seem fitting for T'Challa's son to take up the Black Panther mantle, Wakanda Forever clearly established that Shuri is the right choice, especially considering how young Toussaint is - though she may train T'Challa Jr. Toussaint's MCU introduction also raises questions about his possible future role. It is a touching moment and another way the Wakanda Forever ending carries on T'Challa's legacy within the MCU.

Toussaint then reveals to Shuri that his Wakandan name is Prince T'Challa. In the credit scene, Nakia introduces Shuri to Toussaint and explains that she and T'Challa decided to raise him in Haiti away from the pressures of the throne. The end of the movie finds Shuri visiting Nakia in Haiti where she performs an intimate ceremony on a beach, coming to peace with the death of T'Challa. In an emotional post-credit scene, Black Panther: Wakanda Forever's ending explained that T'Challa and Nakia had a son named Toussaint.

Instal Black Panther: Wakanda Forever