It presents the issue as if it's a sudden surprise problem, when in fact there are established markets for whey and whey derivatives. The global market for whey protein is worth $3.8bn. To call whey (even relatively poor quality whey) "waste" is ludicrous - it's a byproduct with an established commercial value. Acid whey requires more processing than sweet whey, but it's an established and well-understood problem for the dairy industry.
The problem for the yoghurt producer is simply that liquid whey is right at the bottom of the value chain - it requires a great deal of processing to become $8/kg whey protein concentrate or $12/kg whey protein isolate. Yoghurt manufacturers may be extremely keen to move up the value chain and extract more profit from their whey byproducts, but there's no great market failure occurring here.