Hello @neavvy, sincerely Libra will have more acceptance in its beginnings as it comes from Facebook, an application with billions of users who use that platform every day for any use, now, steemit has nothing to worry about because I personally do not believe replace it, but rather that it will be another cryptocurrency more in the market but it is with many people "following" so to speak since as you say is to buy or sell products with their own currency. Libra when it comes out will be a (boom) and with the passage of time will be normal for its people as it is the steem, each platform with its people.
I used the google translator.
Thank you for your comment @suanky
That's definitely an enormous advantage.