If this order sticks, Trump has permanently and fundamentally changed the Executive Branch as it has existed since 1935 in less than a month.

Right up until the next leftist gets into the presidency and issues an EO to unravel Trump's.

It's likely an incredible over simplification but to my mind any litigation over this should be reduced to two rhetorical questions:

1) Was the department created under the authority of the Executive branch?

2) Who is in charge of that branch?

Trying to argue that these departments are "independent" of the office that created them is a de facto attempt to bypass the constitution to create a fourth branch of government. I wouldn't go so far as to call it treasonous but I might be persuaded to that position.

Edit: stupid autocorrect.