[Dr. Jamshid Ibrahim]

Hi Tdol
This can be explained very easily as a law of nature.Things come and go. This can be called the cycle of metaphorization and demetaphorization. Metaphors can be so deeply buried in language that we don't see them on the surface structure. In such cases they are dead metaphors.

On the other hand metaphor in language is an indication of fuzziness or analogous character of language which shows ambiguity as in literature or verbal communication.
Nowadays there is obviously a need for either a precise a(digital) language or an analogous langauge adapted to academic or scientific purposes.
Regards
Jamshid