Hmm,  disagree with that for the following reasons, (Especially your cute (hit) slander)
Just because PoS is Substantially cheaper to run than PoW does not mean their is not an increasing expenditure required.

There is always an increasing expenditure of required Disk Space as the Blockchain expands.
Additionally also an increasing requirement of Ram , as the Memory requirements grow.
As the Number of Wallets increase competition for Stakes, there is an increasing Time requirement to be online and staking.
(And with the above increased requirements, a slight increase in the electricity draw on the PCs.)