I heard people saying it won't affect bitcoin at all, and others say it might destroy it
I wonder what's your opinion about it?
What can be the worst case when it comes to Libra and Bitcoin?
I don't think something will change even if Libra will have even higher marketcap than bitcoin

Bitcoin is the mother of all coins and Libra i think will be centralized , not quite sure . Anyway im for the Bitcoin till the end and don't believe any coin will replace bitcoin and its proven in previous 10 years already