Well, sarcasm aside, it's fairly common to dismiss a new technology that can grow exponentially, because as humans we are tuned to linear thinking. In 1985, McKinsey speculated that there would be 900,000 cellphone subscribers overall globally. Now we can just dismiss McKinsey as just consultants, but guess what, any one in their position would have probably speculated around the same number because that's what the models and the Math would show. Quite similarly, almost everyone is speculating on SDCs based on existing dogma and numbers, not taking into account how rapidly deep neural nets are evolving. Just look at the Imagenet competition history. I mean today we have neural nets that are better than humans at image classification. I'm quite sure, if you had asked even the most eminent researchers to speculate in 2012, they wouldn't have predicted such an outcome. It is also easy to take the position that I am taking, that SDCs will be a reality in the next 5 years, just based on hubris and some Elon Musk cool-aid. However my view is purely based on the growth that we are seeing in deep neural nets.