In Shazam (2019) we see Shazam break
the wizard’s staff after transforming his foster brothers and sisters.
Why did he do so? Doesn’t this have dire consequences for future generations in terms of replacements?
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He was trying to remove any possibility of Sivana gaining the power of Shazam. The staff was needed to transfer the power, so by breaking it there is no way for him to transfer it anymore.
It might have consequences for passing on the power of Shazam, or it might not. The wizards had to have worked out how to transfer their power themselves so Shazam and co. might be able to do the same. If nothing else, they could remain in Shazam form forever and be effectively immortal.