executive power will be expanded massively

I don't think there's any expansion of power left. The POTUS can legally kill anyone he wants now for any reason.

the courts will be fully captured

the courts are already fully captured.

all important gov't agencies will be under direct executive branch control

They already are. That's what the executive is.

We're already there, it's just that no one has really flexed it in ways that most people can see or care about.