I would wager the FFXIV team is keeping a very close eye on the metrics right now. How many of these mounts are sold, if people with the previous version still buy the "new" version. How many are purchased per account and if the pricepoint makes a huge difference in engagement.

If this is successful (lots of engagement, lots of gil removed) , I imagine many MANY new "gold" mounts making their way to the new vendors.