Yoshi mentioned nothing about the actual amount of gil generation. What he talked about was personal player reward for repeatable combat related activities. That's a completely different topic. There is zero evidence of lack of gil generation. Anyone suggesting such a thing is basing it off of really bad assumptions and nothing more.

*If* there is a real threat in the future of excessive gil deflation (there isn't now), SE could implement a bitcoin mining difficulty mining type system. There could be an algorithm that adjusts leve, dungeon and fate gil rewards based on the total amount of gil on the server and the average amount of players on the server within the past couple of months.