Totally against it for the reasons mentioned above.
It will only give gil more "power" and make people more fanatic about it.
Sure, the real money was paid by someone else, but there will be people playing free because of it.

I can afford to sell my wares cheap or simply give them away (loss of gil profit on my side). If this system is introduced, every time I'll be doing that, I'll be effectively granting free time to another player. I can't do that.
I'm giving away things, incurring losses of gil profit because I want to help a player knowing that everything is sealed in the game, for entertainment.
The moment it stops being the case and game time can be bought with gil, I'll be put at a disadvantage while pushing up that person to be able to play for free. Heck, I'm not rich in real life. I would like to play for free too! So, I'd increase my prices, stop giving away stuff and try to charge everyone and anyone for services in-game whenever possible. I might even become irritated when I'll be missing gil near the end of my subscription. FFXIV won't be a game for me anymore then and I'll simply end up quitting (and sell my account, why not).

That's not what I want. I want FFXIV to remain an occasion of entertainment for me and remain the generous player I am now.

So, no.