Why have we ruled out the possibility of finding something faster when we’ve only scratched the surface of space exploration and understanding?
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If you draw a straight line on a sphere there is some maximum length this line can be. Why is that? It is just the geometry we choose. The speed of light is the same thing but less intuitive, it is the fastest speed possible due to the geometry of our universe. If we had a different geometry this speed could be different.
It is also worth noting that anything without mass travels at c in a vacuum so this isnt something only special about light.
As for could there be something faster? No, not really. You would have to invalidate so much evidenced backed theory to make that work and there is no reason to believe that it is at all possible in our universe.
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