Without this threat, we have the situation we have today: Companies never get significantly punished for anything, "because jobs," and corruption is rampant.
Shareholders of VW have already taken a massive hit when the stock tanked. Destroying the company would achieve nothing at all. The efficient and fair course of action is to prosecute the executives who made or authorised illegal decisions while minimising impact on those not involved. Shareholders are not a substitute for a court of law, and rash group punishment has never worked out well.
Maybe it's better to start the change from the other side. Make people understand and feel what it means if they are being cheated of their tax money.
The fundamental human right is not freedom, self-determination, or happiness, it’s the right to fairness and the current world order, imho, is unfair. It will continue to be unfair until the rules are applied equally regardless of which cohort loses jobs or which fat cat banker dies in a ditch.
The market for civil airliners is already far too concentrated and dysfunctional, it'd be even worse with a single player (Boeing).
Finding who's been involved in the decision-making process and punishing them harshly is fair and does send the right message. Destroying a large corporation arbitrarily doesn't.
Besides, in both Volkswagen and Airbus cases, they're far from being the sole bad actors in their respective industries. You'd only hand their marketshare to others who've been slightly better at not getting caught but were really doing the same thing all along.