One thing I would like to mention before this topic gets too in depth.
While the price of berries have been slashed in half, the price of seeds has gone down. The startup cost for a liechi class tree is now approx 4k, and a tree will, on average, produce almost 7k.
The old profits were 5.5k average, and the new profit is 3k average, potentially going to go up if the price of seeds continue to fall.
Also, the price of an amulet coin is currently far below the amount of extra money gained with gym rematches, due to the old 25% buff being increased to 50%
Taking in all these factors, the only decrease in yen production would be from bots. And bots, as a whole, only seemed to affect the price of vanity items with the massive inflation.
I doubt much will change, rather, this just gives people new ways to make money with coin/egg farming.