I think it would great to decentralize exchange and automate the listing of coins based on some computable criteria. This would reduce the fees and would avoid hacking.
Yes decentralize exchange for binance is good ideas but it is not be easy to be implemented by them because still there are no good blockchain of digital coins for them, almost all of the blockchain has scaling problem. Decentralize exchange for binance will happen but it won't be happen for today, however the technology of blockchain is still beta testing. We don't know what is next problem on it, so let's wait and see about it.