The initial crush with hunts will likely die down in a while. How long, I don't know. But it will be like anything else. Think of it this way. Right now, we have about 20 weeks of soldiery under our belt. The reason for the hunt rush is to upgrade soldiery gear and the allagan tomestone weathered weapons. As people fill out their weathered soldiery gear with the upgraded version of it, they will begin to run out of things to spend sands/oils on.

After sands/oils, what is the reason for hunts? Some glamour items? Maybe alexandrite? When things start to die down, the current method many servers use for hunts will fall apart. The "hunt LS" method of banding together 100 players to scout all the zones looking for marks won't work when the amount of people needing seals dwindles.

This "rush" and "dwindling" has already happened a few times:
Release: Fates were the preferred method of leveling. There was a rush of people to nearly every fate. Until...
Patch 2.1: They made dungeons worthwhile to do. Suddenly, the only people doing Fates were DPS waiting in queue for dungeons.
Patch 2.2: Atma - every fate had a rush of people doing it for the first few weeks until everyone had their first set of 12 atma. Now, instead of there being a convoy of players to each fate, there are only a handful and they try to band together in PF, barely keeping 2-3 players in PT.

Hunts will go the same way eventually.