Irvrit/Loshon Hakodesh
Languages are not static, words change, New words are invented old words are discarded and words change meaning.
There is no word in Tanach for electric Light Bulb for example and we are not sure what many of the birds listed as kosher are as they have been forgotten.
Elizer ben Yehuda had to update the language otherwise it was not useable.
If in a time of Moshiach unless we go back to life in the time of Tanach, Loshon Hakodesh would have to be updated if it would become a spoken language.