Funny thing is Shuri doesn't even need to be a BP anymore.
On top her getting a tech/science skills boost, she can rock her vibranium armor from Doomwar and/or go through an MCU-appropriate version of the Griot path for the BP sequels.
T'Challa remains the lead, king, and BP while whooping ass across the MCU in the big screen. Shuri gets a canonical power boost, gets the ability to interact and stand toe-to-toe with almost anyone in the MCU, and gets to whoop ass on the big screen as well.
Win/win, everybody eats
This would be good. My only reason for initially wanting Shuri to assume the BP role in the MCU after T'Challa was because I wanted her to not be reduced to some cameo role. I wanted another character they could push, and one the newbies could also follow. With the path they're taking her, that is no longer a concern. She'll have her prominent role without bcoming BP and still allow T'Challa to wreck ish with his fighting skills and brain.