It is actualy quite a sound theory unlike the star trek one which uses anti-matter injectors and dutirium crystals which i dont think even exist as dutirium is a heavy hydrogen atom IIRC, which wouldn't form crystals H2 metalic liquid would freeze to be like steel i believe and not with a crystaline structure.

A more obvious form and more plausible form is the show andromeda's FTL travel which uses natural work hole nexus for the ships to travel through as Einstein stated that space being warped and worm holes where plausible yet improbable IIRC.

(edit) sorry i meant to say quite a sound theory compared to the star trek theory