http://gamerescape.com/2016/11/15/fa...-fan-festival/

This might actually be a better trans of the actual response. It seemed it might be less about waiting for a mob to spawn and more akin to farming pop items to fight said monster.

"F: Will monsters that pop once every 72 hours appear there?

Y: It’s an easy to understand example, so I used it in the Opening Keynote. It would be hard for it to work in the current age. But, I do think that it is possible to have contents that require some kind of an entry key to challenge them, like FFXI and FFXIV 1.0 had. For example, in FFXIV 1.0 you had to collect Infernal Totems in order to challenge Ifrit. We can’t implement that for all of the contents in the game, but using that system for one “attraction” is a possibility. It would introduce a new concept and values of getting rewards through putting time into getting those entry keys and then challenging the contents to get those rewards. Therefore, we thought it would be a good idea to introduce that to FFXIV, as well. At first, I didn’t want to reveal the name completely, but we announced it at this timing because we thought that it would be easy to understand by players who have been long time Japanese fans of the FF series. The title was unanimous in the development team, as well."