I think ETFs and FOREX in general are two potential goldmines that we've been ignoring.
But their success (in my view) ties to what is being discussed in another thread right now, about having BLABLA.EUR vs EUR .. if you have all of the gateways IOUs trading against other gateways IOUs then it quickly approaches nightmare, especially for newcomers.. how much nicer it would be seeing markets like EUR:TRY or USD:CNY being actively used.
For this ETF, I think it makes a lot more sense, likewise, to trade it against USD, CNY, GBP, and so on, rather than gateways IOUs..
My fear is that we'd go through the hassle of implementing the logic in the price feed scripts, advertise this to the world, and then have hundreds of confused newcomers who want to make some good money wondering how exactly it improves the situation to have the gateway being a trusted party over what could very well possibly be years or decades...
The Smartcoin as far as I can see is undoubtedly the best instrument to trade this sort of stuff against.
tldr CRYPTO10:USD good, CRYPTO10:OPEN.USD bad