The speed of light is OBVIOUSLY VARIABLE, the paradigm shift is impending and unavoidable, but there is too much insanity in physics that confuses and erodes the revolutionary process. String theorists, for instance, repudiate Einstein's spacetime, declare that it doesn't exist, but worship the underlying premise, Einstein's false constant-speed-of-light postulate, and LIGO's ripples in spacetime:

Nima Arkani-Hamed (06:09): "Almost all of us believe that spacetime doesn't really exist, spacetime is doomed and has to be replaced..." https://youtu.be/U47kyV4TMnE?t=369

Nobel Laureate David Gross observed, "Everyone in string theory is convinced...that spacetime is doomed. But we don't know what it's replaced by." https://www.edge.org/response-detail/26563

What scientific idea is ready for retirement? Steve Giddings: "Spacetime. Physics has always been regarded as playing out on an underlying stage of space and time. Special relativity joined these into spacetime... [...] The apparent need to retire classical spacetime as a fundamental concept is profound..."x https://www.edge.org/response-detail/25477

"Rethinking Einstein: The end of space-time. [...] Horava, who is at the University of California, Berkeley, wants to rip this fabric apart and set time and space free from one another in order to come up with a unified theory that reconciles the disparate worlds of quantum mechanics and gravity - one the most pressing challenges to modern physics." https://www.newscientist.com/article...of-space-time/

"We've known for decades that space-time is doomed," says Arkani-Hamed. "We know it is not there in the next version of physics." http://discovermagazine.com/2014/jan...ure-of-physics

So spacetime "is not there in the next version of physics" but LIGO's ripples in spacetime are there, like the grin of the Cheshire cat:

https://images-na.ssl-images-amazon....1J-7PIffiL.jpg

Pentcho Valev