It doesn't work this way. All these corporations are invested in each other to an extent of it being essentially one big "megacorp." With the wartime economy being such a large portion of the pie, and many of the other large pieces not really being impacted, the rest would never break away from them.

You can't look at businesses from the standpoint of what that business actually sells or does. You have to look at it from the standpoint of who OWN it and where they have their money. These people are all in one big club. They would tank whatever company they wanted to if it became irrelevant to their stock portfolio increasing. Hell, they regularly bankrupt companies by shorting the shit out of the stocks and walk away with billions in untaxable profits once the company goes under. They have been doing it for years. Blockbuster, Sears, Toys R Us, Circuit city and many more were ALL taken out this way.