If there was a way to say suspend mass anything can potentially travel at the speed of light?
If there was a way to do even something barely approaching that, the applications are far more important than just lightspeed travel.
For instance, think about only slightly reducing mass of a plane - you can fit more people or cargo in it, making transportation cheaper (assuming the mass-reducing tech is not prohibitively expensive or voluminous, of course).
Think about reducing mass noticeably more - you suddenly get floating cars (you just need to make the contents of the car as light as or slightly lighter than air).
Reduce mass much more ? All of a sudden you get insane accelerations possible (even with live people) with very little energy expenditure, you get to travel to the moon and back in hours, if not minutes. You get to explore and colonize the entire solar system. Heck, you get to REORGANIZE the solar system any way you see fit !
Reduce mass to nearly zero ? Same as above, but on an interstellar scale. Even with 25% of lightspeed, that opens up not just colonization of other solar systems, but also some limited interstellar trade !
If you manage to reduce mass to actual zero... well... yes, lightspeed travel is possible - but not just that - INSTANT acceleration to lightspeed, so from the viewpoint of the traveller, they INSTANTLY arrive at whatever destination you select (stopping might prove tricky), since in their own reference frame, no time has passed at all !!!