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?
Worse is blocking and banning bitcoin most of countries in the world.Then they will some laws who using it.You can search and see few trail works happening in India.
https://www.coindesk.com/another-indian-crypto-exchange-shuts-down-blaming-banking-banTheir aim is introduce some kind of alternative(like Libra) and ban the bitcoin and other crypto-currencies