I agree that there is a viable symbolic or metaphorical interpretation to Revelation 11, I'm partial to the witnesses referring to the old and new testaments given the context from chapter 10, for example.
However, certain elements from chapter 11: their death, not being buried, how they tormented everyone on earth, the length of their ministries, and finally being resurrected by a great shout from heaven seems to indicate 2 humans who mirror the ministry of Jesus. I agree it's not literally Moses and Elijah, but in spirit.
There have been prototypes of the two witnesses before, one pair is Zerubbabel and Joshua, who led the Babylonian exiles back to Jerusalem under decree of Darius. Going back further, Elijah and Elisha were another tandem, Boaz and Jachin, represented by the pillars of the temple, even Moses and Aaron.
In the NT Paul and Silas embody the archetype. While I certainly believe they will amass a small army during their ministry, I believe Rev 11 is talking about 2 persons.
The point of the 2 witnesses is to establish a matter in a divine legal sense. Essentially the witnesses are bearing the testimony of Jesus Christ, which condemns the world. Their death and subsequent resurrection seem to signal the beginning of the wrath.
Any revival surrounding the two witnesses is local and short lived, the end times are marked by apostasy and wickedness. However, I do see many girdling their loins, which supports the theory you've put forth.
There are some who believe that the 144k are in the ministry of the 2 witnesses. According to this view, virgin means clean from idolatry (motb), and the listing of tribes is spiritual seed, the names of the tribes themselves having great symbolic meaning.
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