I think Libra will be the most convenient stablecoin. With a BTC/Libra pair, you can easily use your BTC trading profits to order a taxi with uber/lyft, renew your Spotify subscription or book a hotel on booking.com. There is no need to sell your BTC for usd/euro and then withdraw from exchange to your bank account which takes what? 2-3 business days?
Libra is what all those shitcoins/tokens have tried to accomplish for 2-3 years now by making a crypto card that allows you to easily spent your crypto on goods and services. If it works well and is convenient to use it will make the lives of Bitcoiners easier, if you are willing to sacrifice some of your privacy.
Most real life cases didn't involve any shitcoin. I mean debit cards backed by hard btc, ideally with honest commissions and exchange rates. So why have they failed? They ran into problems with the preexisting monopolists (Visa etc). Visa complained and refused to carry that kind of business. Banks accounts locked and other niceties. That's why. Something is resurfacing slowly but surely. Libra could be a positive actor in this phase, possibly by being an easy, convenient alternative and eventually lowering the bar for more competition.
...and only the Millennials, GenZ'ers, and other clueless pleebs will be willing.
Zuckerberg, is that you?
Not as much as Torque, probably, but I am a bit of the paranoid kind. I wouldn't mind spending some libra on uber that much, but should it or can it even possibly be the only way? Risk of an all-encompassing spying monopoly written in big wet letters on the wall.
What if smaller actors can fly on the mighty dragon's piggyback? Assuming the protocol is provably private, it can be worth a try. Provable privacy requires open sourcing the details, I would say. That's where the devil is as usual. At present it's just marketing bait with probability 0.755 (JJ, the third digit is for you).