The theme of the poem is best captured by the statement:
1. All languages will disappear over time.
This theme is supported by the following two excerpts:
5. "Shall be faded hieroglyphics Ten thousand years from now." (Lines 17-18) - This line directly indicates that the language we use today will eventually become obsolete and may be forgotten entirely over time.
2. "Once in a thousand years Breaking a new course" (Lines 5-6) - This excerpt suggests that the nature of language is constantly evolving and changing, reinforcing the idea that languages are not permanent and will eventually change or disappear.