Hegel's thesis, antithesis, and synthesis.

That is not the way I have understood Hegel.

The thesis is a single idea, yes, but from one point of view only. The antithesis is a conflicting point of view. The synthesis takes both points of view to develop a new thesis which will have its own antithesis and so on until the process arrives at a final and ultimate truth. In other words there will always be thesis and antithesis until you arrive at a final synthesis for which there is no thesis and antithesis. At that point you have arrived at the truth.

I don't think Hegel ever saw it as everybody at some point agreeing on a single point of view but rather his formula was in the defense of philosophy as a means of rationally and systematically seeking the truth out of any complexity.

As simple as this seems, his concepts had a huge influence on the philosophyof his day and that which followed.