If Libra can offer something that Bitcoin hasnt been able to offer so far, then it is quite possible that this project will compete with Bitcoin. But you need to take into account the fact that when it comes to the protection of personal data, it is still better to choose a decentralized project.
The purpose of libra coin only for payment system because it is a stable coin. The price of libra will be same as a movement price of dollar which mean for everyone who consider that libra is the best coin to be use as investment place are wrong. So, Which offer does Bitcoin not have? As payment system bitcoin can be use it moreover for an investment place I bet with 99% the most users will choose bitcoin because it has proven can give the investor get a lot of profit. There is no gap for libra coin to compete bitcoin.