I see this more of a change for the overall game going forward, rather than targeting individuals who have a lot of money. (or targeting everyone based on how some people are interpreting the translation)

There's also nothing saying at this point that the same NPC that will hold your excess items over 100 won't hold your excess gil over 99,999,999 too. Probably just some coding they can put in during the database conversion, if char has more than 99,999,999 gil, transfer the difference to storage NPC. Once the new game is running, you should be able to mailbox gil across alts and then pick up your excess later. At least this is how I hope it can work.

I don't have anything against the people that have over 100 million gil (I surely don't fall into this category) so it'd be nice if they could get their excess somehow without having to spend it all on other things, hoping to recoup their value in ARR.