This is the exact argument that was made by certain commercial vendors in the 1991-93 timeframe who tried to corner the web. They all failed. Mark McCahill referred to this as the "monolithic internet." It was rejected then; it will be rejected now.

On Dec 3, 2009, at 10:26 AM, Patrick Haggerty wrote:

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As an example: a user goes to comment on a blog post and is given the same tools in the same configuration with the same terminology and iconography as she had when she wrote a product review at another web site, which was the same interface she had while posting an update to a social network.

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Michael Fraase, senior editor/ecommunications manager
College of Design, University of Minnesota