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The method used to bridge and preserve the jailbreak is contained in Amazon code specifically marked "don't delete this". It is a special file located in the rootfs (/var/local/ partition) which is designated for emergency repairs, and since the only way to create that file is to already be jailbroken, Amazon is not going to the effort of nuclear war on the jailbreak.
Amazon != Apple.
They will secure their software to a certain extent, but they are not freakishly obsessed with destroying jailbreaks.
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tl;dr
Assume the jailbreak will survive all future updates ever, no matter what. History says that is an accurate assessment.
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