We don't have too . Lowering the limit to 300kb is softforkable AND with the witness discount we can still have 2MB blocks.
The mistake is fixable
wait, how does that prevent people from bloating the chain?
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You can't prevents that. We could prevent the amunt of data that can be stored with each block.
ah okay, and what would that protect, what would be the reasoning there
Limiting the size of the chain so people can still IBD 40 years from now