I used to think big centralized exchanges were important, I'm not so sure anymore. Maybe we should be going a totally different direction, kind of working backwards making exchanges come to us. I've been hodling this other project for 5 years now and they don't prioritize big centralized exchanges, instead they prioritize what they call "velocity of money" - person to person transactions, phone to phone for goods and services like M-Pesa is used in Africa (phone minutes) to buy groceries and pay utilities. Ultimately what they care about is how many people use it for retail, to pay utilities, to buy phone minutes, etc.. and they keep expanding it. Statistics for real world use, for everyday needs is prioritized over any exchange volume. Perhaps at some point the Dao could hire developers to make a mobile wallet app and get everything audited by a white hat security group and release that and see how the developing world adopts it or instead if there are already existing secure mobile wallets that are used in the developing world get us on to those platforms.
Hive-Keychain already exists and supports transfer of SPS on hive-engine.