As xeroc suggested https://steemit.com/bitshares/@xeroc/simple-side-chaining-for-graphene-based-blockchains-bitsharespeerplayssteem
I think it could be huge if Steem, PeerPlays, bitShares can form sidechaining relationship since each chain can benefit from another.
If graphene chains form some kind of sidechain-relation, then steem coin can use bitShares bitCNY, bitUSD market or PeerPlays game platform without risk of volatility of exchanging so synergy can be awesome.
