He's right on price stability. It's one of the reasons why lots of people are too scared to use bitcoin. I do hope the rapid volatility is temporary though. I mean bitcoin isnt popular because its volatile and it's volatile because of the low technology adoption. Hopefully something gives one day allowing for much stabler prices.
Actually, Bitcoin has proven to be extremely popular because of its volatility. It's the merchants who aren't truly ready to abandon legacy fiat who've been slow to adopt Bitcoin (and "accepting" it via 3rd party payment processors instead) because of this volatility. Low technology adoption? Not sure which Bitcoin you've been using but the one I have has upgraded many times and has significant technological updates since I started properly using it in mid-2016.
You want stable? There's the scandal-strapped Tether for you.