I can't say that I'm an expert in this but isn't it quite naturally that the price of gold goes down?
Considering that more gold is farmed each day and we can also assume that there's more people trying to sell gold through RMAH.
I can also imagine that there isn't that many buyers on gold as it is sellers, which will lead to unsold gold which will reduce the price even further.
I believe the price on gold will go down to a point where many players will find it more profitable to buy gold rather than farming it themselves.
Also, I want to ask the thread-starter, how can the reduced price be "non-profitable"?
I don't know how many bots you got or anything but unless you are botting to make it up for the price of elecricity, the bot and d3 game you can't say it's not profitable.
All you do is having the computer on 24/7 while the bot does the rest. With the reduced price you just have to bot for a longer time to make som kind of profit.
So with the reduced price of gold it makes botting LESS profitable.
I may be totally out of line but this is my thoughts.