Welcome to Sphere's blockchain community.
We all know proof of work does not scale well and uses too much processing power, so let's discuss alternatives.
Proof of stake is probably the next on the list. Etherium is soon to move over to POS and it does offer efficiencies. However, with the control being with the biggest players, only those will actually benefit possibly creating a monopoly. It's expected that the threshold will be 1250 either and below this, the stake will be insignificant enough for it to not matter.
I've got my eye on what Hashgraph does with "gossip about gossip" and whether or not they decide to open source it.
Any other thoughts?