How will the transition to ERC20 work? Will it be decentralized or will there be a centralized service that does it?

I think ERC20 is getting a bit old. PotCoin is a good coin. They should have bigger goals. Like they should be an Ethereum 2.0 Proof-of-Stake Shard where PotCoin is the gas fee token. Wait & see on Ethereum a few more months to see what's possible when Ethereum 2.0 is out.