I believe Libra will be a threaten to banks, not to bitcoin.

I see many people saying it would destroy XRP... this is a non-sense to me.

Libra may force banks to modernize, as Libra will be more open than banks (more border-less), but will also follow their rules (centralized, legislation rules, reliable, etc)..
How will banks modernize? XRP may be the answer for them. XRP always tried to get blockchain technology into the banking system.