If it's that they're gonna change something in the game, I doubt it's gonna be related to the (black) main character. I can't imagine it would be an easy fix to fully replace him with a different character at this point.
If people really find it such a big deal I think best they could do is to let people choose their own main male character, like Odyssey and Valhalla.
Ya. What I have seen is mainly related to Ubisoft saying the game is history accurate but it is not at all that. Also they used some stolen / AI generated assets when promoting the game. Also it is disrespectful to have a foreigner going around killing Japanese.
Inaccuracies, both historical and caused by a general lack of research. Stolen assets that they have no right to use, some of which could be considered culturally insensitive. Differences in the English and Japanese "apology" letter which make it seem like they're disregarding the Japanese, or attempting to turn the rest of the world against them. General lack of polish.
From what I understand he is not THE main character he is one of the two main characters.
It would be impossible to replace him at this point in the development and other than the super hard-core racists I don't think anyone wants that at all.