Ha I don't think causality is going to change. That's a lot different from all those other times science changed. It's not only the underpinning of all physics, confirmed by literally every single scientific observation in the history of mankind--it's also just logically inconsistent to break causality. It makes no sense at all. Causes happen before effects, not ever the other way around.

I guess maybe we could someday find an exception to causality, but it would be a way bigger deal than any other discovery we've made. It would be a back to square one situation.

As they say, you can have FTL, relativity, or causality--pick two. We've really nailed down relativity and causality. It's not looking great for FTL. Trust me, it breaks my heart every time I think about it. But that's the way it is sometimes.