Apologies if I glossed over the post with this, but the song 2112 is also about Rush's fight with the record company (the evil overlords in the story), who, after the failure of Caress of Steel, wanted them to make an album of catchy songs again, but Rush basically said, "Screw you, if we are gonna fail, we are gonna fail our way," and wrote an album with a 20-minute song on Side 1, which the record company could not move to Side 2. The album was released, was a big smash, and the record company never messed with the band again as far as telling them what to do.
"We have assumed control" - that is Rush telling the record execs, "We have control of our creative destiny."
Many bands, desperate for success, would have caved, but Rush did not. Even if you do not like their music, you have to give them mad props for sticking to their guns and making it on their terms.