The Alcubierre drive can be summed up as "If I have one thing that's impossible (negative matter), I can do something else that's impossible (FTL)." (And, no, negative matter is not antimatter.) It's an intellectual exercise, nothing more.
It's all very well and good to say "don't be pessimistic" but there has to be an open mathematically and physically valid path that makes it possible or all you're doing is wishful thinking. And right now, there isn't even a hint of a practical path that we can follow, either theoretically or experimentally, that enables the possibility of FTL.
It's all very well and good to say "don't be pessimistic" but there has to be an open mathematically and physically valid path that makes it possible or all you're doing is wishful thinking. And right now, there isn't even a hint of a practical path that we can follow, either theoretically or experimentally, that enables the possibility of FTL.