"It will limit the electricity needed to keep the bitcoin network alive."
Centralised ops would be far more efficient.
Probably true, but that's exactly what we don't want: centralised.
Next year we'll have 1TH/s using 100W. I rather have 100,000 people mining and using 100W than the enormous amount of electricity we're using now.
Yes I agree about centralisation in general, however with mining it seems centralisation is more of a physical/admin optimisation, while actual ownership is or can remain largely de-centralised.