So the only thing this has going for it over cash is that it may ease exchange online (to be seen). And this depends on how easy it will be to join this as a me

So the only thing this has going for it over cash is that it may ease exchange online (to be seen). And this depends on how easy it will be to join this as a merchant or user, how nice APIs will be, and how well fraud will be handled, etc., etc. And the value will fluctuate based on the trust in the ability to convert it reliably to cash/other currencies. So there's no real peg to anything, as described previously.