Maybe, but then again boxing has existed for the last few centuries and has always been full contact. Ditto Judo. Same with Muay Thai. MMA may remain the way it is for a very long time.

As for Dysfunctional Parrot (the blog author) the author simply found there were far better ways to spend his time and money rather than doing karate. He found better ways to stay in shape and didn't feel Karate was that effective for self defense. Karate also took up far too much time, time away from his family. I can't blame him for quitting Karate. If I'm being honest, in his position, I would do the same probably.
"Let your food be your medicine, and your medicine be your food" Hippocrates.