You have a good, well-intentioned point but the article emphasizes that these designers are trying to sell something that's not theirs. That's not disruption.

> Someone will make a service that enables businesses to build applications for $5

Sure, happens all the time. Look at SquareSpace for example. That kind of product you used to need a team of people for. There's examples all over the place. Not sure how you get from there to logo design though. So far computers seem to be at their best when we can clearly describe the rules for them to follow, and design doesn't seem to fall into that category.