So how do they plan to keep form running into things?
Travel at the speed of light rules out radar things. By the time you got a return form an object you would be on top of it.
If you only traveling at 45% of light then I guess it would still work. But the real point is even an object the size of a pea hitting a ship at 45% of light would probably end the trip rather quickly.
Star Trek Tech used deflector shields to eliminate this pesky problem and deal with hostile aliens as a bonus. But that is just as impossible as building a singularity to power an engine.....at least for now that is.