I've always considered that the two witnesses are going to be Moses and Elijah.

However, over the years, I've come across people who see it differently.

Some people think that it will be Enoch & Elijah, because neither of them died yet.

Some think it will be one from among Gentile believers and one from among Jewish believers.

Some think that it will be two messianic tribulation saints.

Some think that it symbolically represents Israel and the church.

There may be other views, which I don't remember at the moment.

Although I still hold to it being Moses and Elijah, I wonder why I haven't come across this other explanation.

Are there any that may consider it to be Elijah & Elisha?

Revelation 11:3 And I will give power unto my two witnesses, and they shall prophesy a thousand two hundred and threescore days, clothed in sackcloth.

  4 These are the two olive trees, and the two candlesticks standing before the God of the earth.

Both Elijah and Elisha made the following claim:

I Kings 17:1 And Elijah the Tishbite, who was of the inhabitants of Gilead, said unto Ahab, As the LORD God of Israel liveth, before whom I stand, there shall not be dew nor rain these years, but according to my word.

I Kings 18:15 And Elijah said, As the LORD of hosts liveth, before whom I stand, I will surely shew myself unto him to day.

II Kings 3:14 And Elisha said, As the LORD of hosts liveth, before whom I stand, surely, were it not that I regard the presence of Jehoshaphat the king of Judah, I would not look toward thee, nor see thee.

II Kings 5:16 But he said, As the LORD liveth, before whom I stand, I will receive none. And he urged him to take it; but he refused.

Also it says:

Revelation 11:6 These have power to shut heaven, that it rain not in the days of their prophecy: and have power over waters to turn them to blood, and to smite the earth with all plagues, as often as they will.

"as often as they will", is different than only when they are commanded.

Both Elijah and Elisha exhibited this:

II Kings 1:10 And Elijah answered and said to the captain of fifty, If I be a man of God, then let fire come down from heaven, and consume thee and thy fifty. And there came down fire from heaven, and consumed him and his fifty.

Then Elisha:

II Kings 2:23 And he went up from thence unto Bethel: and as he was going up by the way, there came forth little children out of the city, and mocked him, and said unto him, Go up, thou bald head; go up, thou bald head.

  24 And he turned back, and looked on them, and cursed them in the name of the LORD. And there came forth two she bears out of the wood, and tare forty and two children of them.

Neither of them were rebuked for doing "as they will".

However, when Moses, at the rock, did as he will, he was rebuked.

Also, as seen in line 6, it says, "smite the earth with all plagues".

Both Elijah & Elisha smote the waters of Jordan:

II Kings 2:8 And Elijah took his mantle, and wrapped it together, and smote the waters, and they were divided hither and thither, so that they two went over on dry ground.

  14 And he took the mantle of Elijah that fell from him, and smote the waters, and said, Where is the LORD God of Elijah? and when he also had smitten the waters, they parted hither and thither: and Elisha went over.

They were not rebuked for this, like Moses was when he smote the rock.

Also, James and John wanted to know about commanding fire to come down from heaven:

Luke 9:54 And when his disciples James and John saw this, they said, Lord, wilt thou that we command fire to come down from heaven, and consume them, even as Elias did?

  55 But he turned, and rebuked them, and said, Ye know not what manner of spirit ye are of.

They were rebuked, since what manner of spirit they are of, is different than Elijah was.

However:

II Kings 2:9 And it came to pass, when they were gone over, that Elijah said unto Elisha, Ask what I shall do for thee, before I be taken away from thee. And Elisha said, I pray thee, let a double portion of thy spirit be upon me.

  10 And he said, Thou hast asked a hard thing: nevertheless, if thou see me when I am taken from thee, it shall be so unto thee; but if not, it shall not be so.

  11 And it came to pass, as they still went on, and talked, that, behold, there appeared a chariot of fire, and horses of fire, and parted them both asunder; and Elijah went up by a whirlwind into heaven.

  12 And Elisha saw it, and he cried, My father, my father, the chariot of Israel, and the horsemen thereof. And he saw him no more: and he took hold of his own clothes, and rent them in two pieces.

Apparently, since Elisha saw him taken, then he was of the same manner of spirit as Elijah.

However, I still hold to it being Moses and Elijah, rather than Elijah and Elisha.