MBAs can only pull this off when there is no competition and they are in bed with the regulators. You can very easily get Boeing back on track by splitting them into multiple competing businesses, but we all know this won't happen.
But regardless of that, breaking up a large company because it has some problem doesn’t fix the problem. It just makes all the smaller companies you created easier to purchase. Just look at AT&T. NorTel bought every single one of the baby bells within a decade of their creation, resulting in just as much of a monopoly except now in a foreign corporation.