There are things about quantum mechanics and potentially dimensionality we don't understand. It's probably unwise to say that FTL communication is totally impossible. But impossible with our current understanding of physics and the universe.
Is it possible without violating causality in some way? Hm.
The thing about the warp drive is that it seems to preserve a universal frame of reference- in the show. I.e. if you drive away from earth at warp factor 9, turn around and drive back at warp factor 9 after a light year, you don't wind up at past earth (unless you also whip around the sun a few times on the way lol). This is not how it would theoretically work in real life, where indeed you could wind up backwards in time. But, wouldn't this be outside of your light cone? I don't know.
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