RE: The Speed of Light Has Been Fixed! All Hail the Metrologists!
Fixing the speed of light is not really a problem.
Units like meter and second are convention. The original meter was someplace in Paris and the original second a subdivision of the length of one day on earth. Given these assumptions we can measure speed of light in m/s.
But there is no need to use these conventions. I can just as well say that the speed of light is one. Then I keep my definition of second and now what I can measure is what a 'natural' measure of length is. The distance light moves in one second.
Both cases are equivalent and there is no reason one or the other would be superior. And in the first case meter and second are not measured but defined and in the second the speed of light is defined and as you say the meter is now defined in relation to the speed of light and a second.
There are many problems in science, but I would not call the speed of light to be one.
There is one HUGE difference between the two systems.
In your system where the speed of light is 1, can you measure changes in the speed of light?
What if the speed of light told you something extremely important, such as when the speed of light goes up, the stock market will go up, and when the speed of light goes down, war breaks out? (The speed of light is actually more important, but i don't have a better analogy)
So, measuring the speed of light is very important.
Assuming that the speed of light is constant, and so making a rubber ruler to measure it keeps you from ever knowing this.
Fixing suggest an active act of humans. But that's how it works.
The speed of light in a vacuum is always the same. Humans just took note of something that has always been the case.