The proposed investment wouldn't increase revenues. A look at the graph of the BFP on this page will show that, in fact, this is true. But the dairy took this as meaning that the outlook for milk prices was favorable. Favorable is relative, depending on where you are at the time. Rather than concentrating on how it could reduce costs, the dairy chose to focus on something it basically can't control - milk prices.
All dairies basically have the same gross revenues per cwt.
Some people make money and others don't, and the difference isn't because of the milk price. Keep cost control tight, and make more money when the price is high. Price forecasting is a favorite activity, especially at this time of year. Supply and demand affects prices, but, in an industry that is as regulated as ours, institutional changes can affect prices as well. There is little an individual dairyman, by himself, can do about them.