I think Libra will be very successful, but I don't think that this will affect on BTC. However, BTC might have to descend from the throne.
I think Libra will have the biggest market cap if it got implemented well in what's app and messenger.
We never know what will the future bring to this project, with so many negative news about this project the only thing that will makes it successful is the
usages that it will bring to the industry. It is a centralized project and the sure thing is it will be use as what it serves originally.
Don't have idea if how crypto lovers will embrace centralized project. Will wait till time reveal after the full implementation of this coin.