The right hand of the Father is not the throne of David. Messiah is sitting there UNTIL His enemies are made a footstool for His feet. THEN he returns and rebuilds the fallen throne of David, on which he will sit and from which he will judge the nations.
Actually, you are saying that the David's throne is empty? Right? But I say that Jesus is sitting on the throne of David right now. I admit that takes some study to find. Anyway, David's throne is God's throne, and Jesus is the one that was raised from the dead to sit on that throne. Scriptures say that Jesus is now sitting on that throne - in heaven. I don't have the time at present to show you all the scriptures that back my statement up - maybe later. But I'll stand firm on what I said.