I really hope, that Libra coin will help to near the mass adoption, but there is no way that such a centralised coin could compete with BTC or ETH for the first or second place on coinmarketcap. This would never happen on this market.
I agree libra coin wouldn't be taking over what path did bitcoin had been through. This was just a regular altcoin who happened to be popult due to social media backed up. Without any sort of reasons like that, there's no possible point that it could be appreciated on that point.