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?
Libra would take away any financial transactions for buying and selling from bitcoin. Libra may replace bitcoin as the most prominent trading pair. But that too may be beneficial for the price of bitcoin.
Libra in no way is a competitor to bitcoin but it would surely make stable coins like Tether, TUSD, Paxos and others obsolete.