Multiverse T'Challa only works in a very specific way. But it's like you said, it's not just getting another T'Challa. It's about continuing the journey T'Chadwick started. The most recent interview Feige goes on about how when hearing Chad passing he was concerned about his family and his wife and his legacy. Yet he was pretty damn clear what he thought about legacy wise when he approached roles. He set up MBJ to succeed after him in all my children, he established the biggest black male lead of all time and wanted T'Challa to outlive us all... Those were his own words.