Marvel hasn't made any formal statements on the situation as of yet, and it's probable that they are still gathering data and evaluating the situation. But, there are a few things that they will probably take into account before choosing.
Marvel will first need to consider how serious the accusations against Majors are. In order to avoid linking their brand to any wrongdoing, Marvel may decide to distance themselves from the actor and recast Kang if the allegations are found to be genuine.
Second, Marvel will have to evaluate how changing Kang's role might affect the Marvel Cinematic Universe (MCU). Kang is an important figure in the MCU, and his disappearance can throw the narratives out of order. Before making a choice, Marvel will need to weigh the advantages and disadvantages of recasting Kang.
Marvel is ultimately responsible for deciding whether to recast Kang. The studio will have to take into account all pertinent elements, such as the seriousness of the claims against Majors, their possible effects on the MCU, and the franchise's overall best interests.
In conclusion, it's too soon to predict what Marvel's choice will be regarding Kang in the wake of Jonathan Majors' arrest. To find out more, fans will need to wait for official Marvel announcements.
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