I don't know that She has, other forms of government are tolerated as long as the Church is permitted to operate.
Even as a non-Catholic, I for one will never give up on the "old altar-and-throne model." There is one organization on Earth that is guaranteed by the Lord of History to never fade away, long after the liberal regimes of the modern world are relegated to a few pages in a history book She will be there to pick up the pieces, again...
And perhaps someday I will come to share this conviction of yours, and join that organization. Stranger things have happened...