Let me rephrase it for the pedantic. I can imagine FTL travel, but can we do it with existing technology? No. Could we do it in the future: it’s possible. Someone may develop a way of folding space, or we may figure out propulsion that gets up to 0.9x, who knows. That’s the part I’m getting at.
Just like now, there were people back then that said “without a doubt, that will not be possible”. Human understanding is constantly shifting and growing.