In the legacy wired voice markets, it once was an ironclad rule that the Regional Bell operating companies represented about 90 percent of lines in service.
In the U.S. wireless market, just four providers have about 90 percent market share.
As discrete video, wireless, broadband and voice markets start to merge, different names will start to appear. And it is conceivable that the share held by the few providers with the most share will broaden. Something more like a classic "80/20" distribution could occur, where 20 percent of providers hold 80 percent share.
What seems unlikely is that the roughly "L" shaped curve will change. You would be hard pressed to name a single business category (subscribers, profit, profit margin, revenue) where such a distribution is absent.
The obvious strategy inference is that if one is not likely to be found among the ranks of the 20 percent with 80 percent share, one had better have a clear niche. Geography, packaging, price, lead application, user interface, device, channels, customer segment or intangibles are typical ways providers differentiate.
In a service provider business spinning off more than $1 trillion annually in revenue, even small niches, fairly far out on the "tail" of market share, can be big businesses.