Libra is going to be a stable coin for the most part and is really just a stab at being digital cash for people not into crypto to use. While it will get a lot more users to have a wallet and spend money like they would send crypto it won't directly get people into crypto. I could be wrong depending on what connection coinbase has to the coin. At this point, I have not heard that you will be able to earn libra from posting on Facebook so I don't see it as pulling people away from steem and the others. I do hope it bring in more money to bitcoin and the other major players. Now is the time to really push to get steem on Coinbase. That would change a lot for us.