I'm not a scientist of any kind, but I've always thought that no science was truly "settled". My understanding is that the speed of light is one of the most tested things in science, and therefore it would be really surprising if anything was found to exceed that speed. But the possibility of overturning something we "know' is always there -- even if it's only for specific cases or situations.
I would think this would be especially true for cosmological science. What we know about physics beaks down inside black holes (e.g., yielding a lot of infinity values), so it's clear we have something wrong with how we see the universe. Having to rethink the speed of light might be part of that problem. (Again, I'm not a scientist, but that's what comes to mind.)
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