With multiple kill vehicles that are capable of repositioning themselves in flight (like the ones shown here: http://www.youtube.com/watch?v=B9mNNA2gEF8), I don't even think you can call that an advantage.
The only advantage I can think of is the possibility of a return flight, but that only matters if reuse is economical vs an expendable vehicle (probably not), or if the cargo is "precious", i.e. a human. Given the prevalence of drone aircraft (including some that can stay airborne indefinitely), increasing capability of satellite optics, and literally decades of refinement on ICBMs, I'd have to say that this pursuit is more likely purely for research. (Of course, as a researcher you always have to "sell" your experiments to the decision makers with lines like "strike anywhere in under an hour".)
The only advantage I can think of is the possibility of a return flight, but that only matters if reuse is economical vs an expendable vehicle (probably not), or if the cargo is "precious", i.e. a human. Given the prevalence of drone aircraft (including some that can stay airborne indefinitely), increasing capability of satellite optics, and literally decades of refinement on ICBMs, I'd have to say that this pursuit is more likely purely for research. (Of course, as a researcher you always have to "sell" your experiments to the decision makers with lines like "strike anywhere in under an hour".)