Next year I believe they will start implement energy labels to blockchains and only cpu focused algorithms make sense than. Besides of course proof of stake / Masternodes.
This doesn't make any sense, energy labels for blockchains.
What dictates whether a blockchain uses more or less energy is the equipment used for mining. Which tend to, as technology evolves, consume less energy.
That is why it is not the blockchains that have to have energy labels, but the equipment used for mining.