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If it is predicted that in the distant future the other galactic super clusters will be so far away, due to continued expansion that we won't be able to see them, why do we assume that beyond the observable universe there isn't more that has already expanded too far for us to see?

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If it is predicted that in the distant future the other galactic super clusters will be so far away, due to continued expansion that we won't be able to see them, why do we assume that beyond the observable universe there isn't more that has already expanded too far for us to see?	1