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If microprocessors lasted only 5-6 years before they were replaced by a newer type of technology - then, yes, they would be just a fad. :)

So mosaic, for example, was just a fad?

The concept was not a fad. The concept was an advance which has lived on in other browsers.

With imagination perhaps, one could even apply the paradigm of a browser to mechanical and biological domains ("non-computing" in a software sense).

concepts vs. tools for strategic business and market advantage

IMHO

1) interpreting of tags

2) sending the tagged content at a site, to an enquiring browser so that in a virtual sense, one is visiting the location.