Very little will likely happen, unfortunately.

MMO's are lagging behind when it comes to customer care and public relations. Last month I ordered some items from a luxury supermarket so I could host a dinner party. A couple of the items were not in stock and the terms of service stated that they would be replaced with something equivalent to their value and as similar as possible to the original product. When I went to the store to pick up my order they had replaced things sufficiently, yet they apologised and also threw in a free bottle of wine and a box of chocolates as compensation. They didn't need to do it, yet it was a pleasant gesture.

As far as FFXIV is concerned...service has been interrupted for a great many players. Plans have been disrupted. Progress has been lost. Compensation isn't owed due to the wording of the terms of service but it would be a lovely gesture for an in-game item to be sent to every player as a little 'thank you' for sticking with the game even during turbulent times. It'd do wonders for PR if nothing else.