If the dev team had infinite resources then sure - re-evaluate the wait time. Change it to 10 min or 5 min. I found the wait irritating and am not opposed to changing it. However, there is a certain amount of effort required to change the wait time and I would rather have the dev team spend that effort elsewhere. Like on housing or bots in PVP or opening up the diadem for small groups or <your fav goes here>

(In the software group where I work it takes 1/2 day to do any change to the live system - and our product is no where as complicated as FFXIV. I am guessing it would take them at least that long. )