Retailers encouraged to squeeze supply chains

It was with horror that I read an article in the Grocer, 26th October, by a group of consultants who suggest that retailers could gain the following amounts by squeezing their supply chains harder!, yes harder!
Tesco could gain £6billion
Sainsburys could gain £1 billion
Morrisons could gain £1billion
Booker could gain £271 million
Cranswick could gain £50 million
This is not a zero sums gain, these gains would be at the expense of the suppliers  that are on the receiving end of the squeeze and on suppliers further down the food supply chain.
I don’t think there would be much of a supply chain left at the end of such a squeeze.