There are more than enough goldsinks already in the game, apart from guild buffs.
For example, to roll the rest of my cards, I am roughly going to need 1kkk gold for the stones alone. There is barely enough gold on ah to do that and keep in mind, I'm just one person, who has already done some zones.
Imho this shows that the current gold economy is not sustainable and is bound to collapse.
Currently, farming gold is the most tedious activity I can think of and it saddens me greatly how much fun it takes away from the game (at least for me and my guildmates).
I'm all for providing new players with oppurtunity to earn diamonds. However, gold will still be needed in large quantities, mainly for tierstones and the aforementioned card system. Hence the demand will still be there. Moreover, taking a look at who is offering gold for sale atm, about 80% of the overall volume is coming from players that are most certainly no newbies.
You are right actually, maybe we can farm gold for guild buffs. But farming gold for cards is almost impossible. Like you said if every player needs 1kkk gold for their cards, it is really too bad. ISS also consumes a lot of gold. Who really wants to farm 400m gold to unlock a 104 lvl iss ? In my opinion they should reduce all gold prices. DEVs should make 6% guild buffs 1-2m gold and bring a huge discount to all gold prices in game. Such as rune extraction from items and ISS extraction.