[pfdietz]

I see no reason to think FTL will ever be possible. That FTL is a trope in SF stories doesn't meant it's an aspect of the reality, it just means that it enables one to write more interesting stories.

[Seb-C]

With our current knowledge and technology, you are right, but nobody knows what we might discover in the future.

Even if FTL were indeed impossible, I think pursuing it would bring interesting discoveries and technologies.

[pfdietz]

Replace FTL with witchcraft and the argument would be identical.

[Seb-C]

Any sufficiently advanced technology is indistinguishable from magic.