I understand that A9LH is initialized prior to the operating system being loaded and hence any updates are performed in the modified environment, however I can imagine that if Nintendo wanted to search storage and/or memory for elements of the exploit and simply prevent the system updating or introduce elements in their update that clobber required A9LH resources they could do so fairly easily. This would of course be circumvented with updated modules for CFW or A9LH but there's nothing I understand about A9LH which makes it 'future proof' (without constant updates from the authors) should Nintendo wish to engage in a game of cat and mouse with hackers.