The US dollar is only the worlds currency because the Sauds and China still accept that, for different and similar reasons.
And while Bitcoin can hold its value (at least for 2 years more) because it was first, teem will drop like a stone on Jupiter if the bandwith/loading time etc. problems don't get solved instead of only band-aided every 3 month.
We will see Steem to the star with $100 value