She is right at what she is posting latter. But the first post you quoted is really silly. Bitcoin price is so unstable that will be way different next week not just a year from now. The point she is right about is that future trading makes bitcoin more stable. So growths and declines will be less sharp. Both ways will be more stable not just the way up. And that is good, money need to be as stable as can be.
The first serious derivative salvo arrived just at the death of the last bubble and since then it's been a steady decline into poo soup.
She's right to raise the possibility. That's unquestionably where most of the 'institutional investors' will prefer to go, but everything flies out the window if there's proper a bubble on or the sniff of one.
We need all this new guff to be present for another 2-3 complete cycles before its effects can be properly analysed. Until then it's just groping in the dark.