I think humans have a default toward tribal thinking. We view "us" as superior and more cherished than "them". I don't think most people will agree that they, personally, are prone to it; but it shows up in a hundred different way in life. I spotted that thinking in myself when I saw that the next oracle wasn't a terrible foreign enemy, but our Jerusalem. This should remind us that when we act like the enemies of God, we shouldn't be surprised to find ourselves on a list that includes those we're acting like.
It seems like this chapter is related to the events immediately before, during, and/or after the reign of Hezekiah.
The close of Chapter 11 of Isaiah is a prophesy that the remnant of Israel will pour out of Assyria like a highway, the second exodus. This will be paralleled in the Millennial Kingdom as God calls forth the dispersed Jews to be his Royal Priesthood. Chapter 12 picks up there.
As Israel and, eventually, Judah race toward oblivion for life as they've known it, the Kings and Chronicles give way to prophets who seem to be God's final effort to turn their trajectories toward His will and away from their idolatry and rebellion.
In my attempt to read chronologically, one of my reading plans says Amos is next and the other says Isaiah. So I have decided to start with Isaiah. Although I'll start Amos after Isaiah 8, and will keep checking in with the Kings and Chronicler.