Most of what you mentioned is content or things that make life easier for people. New players will want to be a part of this to keep interested. Your suggested gil figures are nowhere near enough to be effective unless they combine it with the changes to leves and NPCed items I mentioned.
Ideally the game servers will have more gil going out than coming in until the right amount of gil exists and then gil sinks can be reduced to a point where gil coming in is the same as gil going out. I think this is how XI's hyper inflation was dealt with but I may be wrong.
Problem now is if you change the value of gil too much people who are stockpiling it become insanely rich while people who aren't fall further behind because it will be way harder for them to close the gap. It looks like we'll have to live with the big numbers.
But the only way to make gil worthless is to make items worthless or untradable so that you don't need much gil to buy anything. Gil is currently useless because every item is dropped/gathered/crafted like candy with the exception of +3s and certain NM drops. A healthy economy is a nice thing in an MMO so to make everything untradable or drop/made like candy would be disappointing. I want to see an economy similar to XI's early years (before the hyper inflation) where battle players can farm good mats that have value and crafters can turn them into items that have value. But the supply of those mats is just right so that crafters can't mass produce them.
Anyway about insane gil totals. The way I see it, if you have 100mil gil in XIV you would have had 10mil in XI. No one would have cared seeing a player with 10mil, you needed 100mil to impress people in that game which would be like having a billion in this game. So items that will eventually cost 30-50mil in XIV won't be seen as expensive as the price tag suggests. They'd be the 3-5mil items XI had. Expensive but affordable if you've worked for gil. The funny part is we're all faffing around selling items for 50-100k that we'd not waste our time making and selling for 5-10k in XI. Big numbers are an illusion of wealth.
I don't think the first generation of crafters had that much advantage. I was just off the top of the curve (something like the 5th 50 goldsmith) but I've made more gil in the past 2 months than I did in all the months before that. My income is higher now than it has ever been despite there being a flood of rank 50 crafters. I've not even made a crab bow yet if you think that could be why (though they're coming this week). There's that much gil on the server you can make 10mil per week with little effort. But that isn't going to last forever. Best stock up now while you can.