summary...
seems someone wants to go pos so they can have their cake and eat it
in the end pos advocates end up revealing their motives are about wanting rewards without any costs
using boring arguments which "economically" is empty of validity
p.s its obvious when the title is "economical" not "security" as its bases for prefering pos
You do realize, that the block rewards could be set to the exact same schedule as now,
and that when all block rewards ends, the bitcoin staker would only earn transaction fees.
This would also end the nonsense of non-mining nodes as all nodes could be staking nodes
and since they earn profit end the nonsense that the blocksize can't be increased because people can't afford to upgrade their hardware.
PoS can do fixed rewards so their are no changes in the current inflation rate.

But hey choose PoA or some other energy efficiency design,
PoW is the failure, prefer another energy efficient algo, then no complaints here.

PoW energy waste is an attack vector on 3 fronts.
1. Energy Footprint showing Location,
for seizures or destruction of ASICS2. Public Relations Nightmare ,
raising the general public electric bills3. Pretense for Governments to Ban Bitcoin Mining