The constant of (('c') ('-c')) cannot be "violated'. Stand in the middle of your room and turn 360 degrees, what do you observe concerning light? Go outside into the widest area you can find and turn 360 degrees, what do you observe concerning light? Go aboard an aircraft, or a starship, with a 360 view and view 360 degrees worth of observation, what do you observe concerning light? You observe that it has only one front to it, the front toward the observer (the front toward the universe immediate to the observer, always oncoming to the observer at it's horizon constant of 'c')). Single-sided 2-dimensional frames of historical time englobing each and every observer in a local cocoon of light-time, of which the other end is always and only the distant Planck and BB horizon. It is a horizon "nothing" is outside of, therefore it is a horizon "everything" is outside of. Thus, it will not be violated because it cannot possibly be violated.Well observable universe is just that, all we can ever experience no matter what tech happens.
We are stuck in some small part of this BB bubble never to see what is beyond and as matter beings we never will since faster than C would turn is into radiation unless a different way to travel is discovered that bypasses physics.
At best we have a shrinking frontier of what can possibly be visited with any tech.
If the BB truly is all that exists then the start of it was infinite speed since it violated C and that can never be reached even at infinite speed.