There is a solution...

- IP address / IP range hashrate cap - this will prevent everybody from creating big farms, just make a cap of share to every IP address and another cap for IP ranges to prevent from Multi-IP addressing.

This will solve the biggest problems:

- it will not consume so much electricity
- it will be more fair play
- it will prevent biggest farmers from affecting the market, 51 percent attack possibility and centralization

An example, make a limit to a single Ipv4 address, another limit to /24 IP address range, another to /20 range etc. The same for IPv6 ranges. E.G. 2 Mhash limit to one Ipv4 address, 6 Mhashes to the whole range, and so done.