I'm an almost 25-year veteran of the cable industry and I can tell you that Comcast and Time-Warner didn't grow huge via word-of-mouth. The benefits of cable service grew community systems by word-of-mouth, then Comcast and Time-Warner grew by acquiring and consolidating systems.
For example, Time Warner Cable Oceania now provides cable service to the entire Hawai'ian island chain, but they had just bought out the last two systems (by island) in 2002 when I visited. Where I live, Comcast acquired Adelphia, who had acquired AT&T, who had acquired TCI, who had acquired Telemedia.
The Robber-Barons of the 1920s consolidated steel, railroads and banking. Edison and Westinghouse (with Tesla's AC) consolidated small utility companies AND supplied most of the equipment.
I think acquisitions played a huge part in the growth of airplane companies too (McDonnell-Douglas was originally two companies) ... there are very few car companies now compared to the early part of the 1900s and most recently we've watched banks become huge through acquisitions.
Unfortunately, I think the premise of the article is completely wrong, but I wasted my time reading until the end and wondered how so little content could consume so many words. You grow big by knowing a market could be huge and then having the confidence to buy when the price is right (even if the indicators aren't in your favor at the moment).