So what is the current best way to make gil?

[Risvertasashi]

But I do agree 100% with the observation that the prices ARE tanking significantly.

This happens every single patch. Those with no understanding of economics will rant about undercutters, but really what's happening is supply is stabilizing in a new market.

That said, if you're really into crafting... you can make a lot of gil by being among the first to get the new recipes and sell them. (I'm too lazy to do that, personally)

There is also the gathering classes like Miner and Botanist since mats are in very high demand now with 3.0 still being young.

Also using the retainers to gather the right mats can give you a good amount of gil each day by selling those mats to other players.

More excellent advice.