Ultimately the biggest issue with interstellar travel is the distance factor (with even the nearest star being over 4 light years away). Warping spacetime aside, a major limitation is how long it takes to even reach interstellar velocities (even at 1G it takes the best part of a year to approach light speed and you still need to slow down before you reach your destination). Overall 1G has many benefits but requires an enormous amount of energy if it is to be sustained over a prolonged period. If energy teleportation turns out to be a practical solution then many of the issues could be resolved (we could also anticipate a reduction in the spacecraft's mass as well).