The events of new characters introduced in Phase 4, the MCU hasn't established any solid setup for another franchise-wide team-up. However, that could change before Phase 5 comes.
Although Wakanda is an essential location within the MCU, it hasn't displayed the influence one would expect after revealing itself to the world. The Wakandan throne opened its doors at the end of introduce the new Black Panther, but it can also transform Wakanda into the home of the next iteration of the Avengers.
The events of the MCU's next Avengers team, guaranteeing that they can be free to make their own decisions and be held able by a reliable government. After all, Wakanda's decision to share their resources with the world makes them a trustworthy authority.
Regardless of whether Wakanda chooses a new ruler or dissolves the monarchy in Black Panther: Wakanda Forever, it could eventually select and represent a new team of superheroes internationally, potentially making them available for other governments in case they're needed across borders without many legal controversies. Wakanda can also provide the team with the necessary resources, training, and gear in order to be more prepared for future threats as big as Thanos. Of course, this also brings some risks, as the rest of the world—or the Wakandan citizens themselves—can begin to distrust Wakanda's power. Nevertheless, as the Avengers' new headquarters, Wakanda could become a modern-day Olympus for the godlike heroes of Earth.
In short, Wakanda's status as a generous and transparent kingdom makes it an asset for the next Avengers team. New heroes such as Sam Wilson's Captain America, Shang-Chi, and She-Hulk would worry less about legal and political obstacles and instead put all their focus on protecting the planet. While Avengers 5 may come much later than Black Panther: Wakanda Forever, the Black Panther sequel can start setting the basis for a more prepared group of Earth's Mightiest Heroes.
