The reason big new things sneak by incumbents is that the next big thing always starts out being dismissed as a toy. This is one of the main insights of Clay Christensen’s “disruptive technology” theory, which has been widely studied but I think is still rarely applied because it is so counter-intuitive to conventional management practices.
Disruptive technologies are dismissed as toys because when they are first launched they “undershoot” their users’ needs. The first telephone could only carry voices a mile or two. The leading incumbent of the time, Western Union, chose not to acquire telephone technology because they didn’t see how it could be useful to businesses and railroads – their best customers. What they failed to anticipate was how rapidly telephone technology and infrastructure would improve. The same was true of how mainframe companies viewed the PC, and how modern telecom companies viewed Skype.
The list of top internet companies in 10 years will look very different than that same list does today. And the new ones on the list will be companies that snuck by the incumbents because people dismissed them as toys.
And that's why you've gotta stay hungry.