I'm bullish on Bitshares for these purposes. Especially if the project adopts a similar bandwidth-limited algorithm that Steem uses in order to remove trx fees entirely. Maybe MKR too... since they are making a stablecoin pegged to SDR which is a basket of currencies.

IMO, Stablecoins are necessary to create a proper digital medium of exchange that will facilitate the transition between the traditional economy and the digital economy. Your picks make sense from the perspective of communities that appear to be growing, and I like the idea of privacy features for blockchains, yet I still feel a value transfer network is a fairly limited use case and there are promising blockchains that exist today that offer the features of a value transfer network without wasteful PoW mining and including additional features such as on-chain exchange.