However, there is so much evidence now supporting relativity that, if it is wrong, it will have to be wrong in a small way that does not change these basic principles. You might say that maybe Einstein's theories of relativity are wrong. In fact, the phrase "faster than light" is physically meaningless.
Because the concept of "speed" requires measuring a certain amount of distance traveled in space during a certain period of time, the concept of speed does not even physically exist beyond the speed of light. Therefore, this tells us that nothing can ever go faster than the speed of light, for the simple reason that space and time do not actually exist beyond this point.
A reference frame with zero width and with no progression in time is really a reference frame that does not exist. If you look at the equations which are at the core of Einstein's theories of relativity, you find that as you approach the speed of light, your spatial dimension in the forward direction shrinks down to nothing and your clock slows to a stop. Instead, space and time can warp and bend. In other words, space and time are not a fixed background on which everything takes place in the same way it always does. It is difficult to visualize this if you have never heard about it before, but scientists have found that the faster you go, the more your spatial dimension in the forward direction shrinks and the slower your clock runs when viewed by an external observer. The universal speed limit, which we commonly call the speed of light, is fundamental to the way the universe works.