The cheapest items that people actually buy are probably going to go up in price. Speaking strictly in terms of percentages, those prices can seem to be hyper inflated. But using a 200g item as an example is not even remotely the same as using a 150,000,000 gil item.

And the most important thing that people seem to either choose to ignore or just not think about... is that prices for ultra cheap items fluctuate greatly in relative terms quite separate from changes to the value of the money in circulation. And those prices are pretty much purely dictated by the current supply of an item compared to the current demand for it.

Another very important thing to remember about your 200g silver ore is that the current vendor price for silver ore is 1500g. Following the global redenomination for gil that vendor price will be 150g. Even if the prices for something so cheap weren't going to fluctuate that much it would never exceed the vendor imposed price ceiling of 150g (atleast never very successfully.)

People seem to want to make two different arguments at the same time. The first being that they are somehow losing money in the 2.0 conversion, which just isn't true. When they can't make a case for that argument they jump to the argument that the new economy in 2.0 won't be a straight 1/10th conversion. Which is perfectly true and a valid argument, if anyone was actually arguing that it would be.

Many of us have used examples from the current economy because that is an easy point to relate to. That doesn't mean we believe the new economy will be completely the same, and any argument from that standpoint is weak, whichever side you happen to be arguing for.

So here are two statements that hopefully people can appreciate and understand:

The universal reduction in gil means everyone has the same relative wealth, just in a smaller number.

and

When 2.0 goes live the economies will be brand new and will need time to stabilize. (this statement is completely independent of the redenomination. Even if they were not changing gil at all it would still be true.)

You can then put those two statements together:

In 2.0 the economy will be brand new and will need time to stabilize, but you will still have the same relative wealth going in to this new economy.