Thanks for the question.  You should bear in mind that Daniel 7 is an apocalyptic vision, so taking things literally is pretty questionable.  The physical description of the beasts is not literal.  We need to be careful about overly stretching the meaning of Daniel 7:27, but I believe it is saying something like this:  Daniel 7:27 is about the Kingdom of God.  In a spiritual sense, “the sovereignty, power and greatness of the kingdoms under the whole heaven will be handed over the to the saints, the people of the Most High.”   The world may not acknowledge this authority!  Despite this “his kingdom will be a everlasting kingdom” and in this kingdom (be it the Church or, later in heaven), “all rulers will worship and obey him.”

In other words, this verse is a description of the Kingdom of God.  In this kingdom, all rulers will worship and obey God.

Another way to think about this passage (although I do not think it is the best or most likely way to view it) is to think in terms of Philippians 2:10,11 in which God tells us that, eventually, at the end of time, every knee will bow and every tongue confess.  Even if the “rulers” do not worship and obey Jesus now, in the end they will.

I hope this helps.

John Oakes