It is by far more disrespectful to not recast Tchalla than to recast him.
To not recast him to me it seems like there is a ulterior motive. Probably jealousy or maybe a bigoted issue.
To not have Tchalla in a BP movie makes no sense. If fans really care or have sense they will boycott BP2 and future BP movies until Tchalla is casted.
It's very disrespectful. First current age major so called black hero and he gets swept under the rug.
I get it mr. 42 aka Boseman apparently passed away.
So have many James Bond's and Superman.
Boseman did not own or make Tchalla or BP. Stan Lee and Kirby created him and now Disney owns Black Panther. Okay since Stan Lee and Kirby passed why not cancel the mcu?
Since Walt Disney is dead why not cancel Disney?
Overall, I feel it's disrespectful to not recast Tchalla than it is to recast him. BP2 will seem very stupid to not have Tchalla. Any in story reason for Tchalla not being around will sound horrible and rushed.
BP2 will likely be worse than the first.