I'm not the biggest panther fan out there, so I've got no dog (or cat) in this hunt, but I don't know how to feel about recasting vs Shuri taking the mantle. Recasting, even talking about recasting sounds disrespectful right now, but it might not later, emotions are very raw. Bringing in Storm, Namor, or bringing back Killmonger are horrible ideas. MCU Shuri isn't interested in being a queen or a superhero, at all. She's content making things in her lab.