It is pure science fiction and should never be discussed by anyone who is serious about physics. Warp drives are always going to be science fiction, just like wormholes are science fiction. The Quantum field exists! The amount of energy in a cubic centimeter of empty space is more that the entire amount of particle energy in the entire universe. This is just as impossible as the perpetual motion machine. It is anti science to believe in such notions!Such people are always right up until the moment that someone proves them wrong.
Heavier than air flight was likewise once thought impossible and the science of aviation was considered a realm for quacks.
Then it happened and it was quickly adopted worldwide.
Splitting the atom was once thought impossible.
Space flight was once thought impossible.
LASER technology was once thought to be impossible.
In our current time it was just a few years ago that artificial intelligence was denounced as impossible by all the proper people and now less than two years after it made its public debut it is widely embraced as if it always existed.
Whether or not warp drive is possible is up to whoever does or does not make it possible. But to say with authority that something we don't understand is categorically impossible is an act of hubris and nothing less.