Though the concept of a fast-moving short war was not what guided German decisions in previous years, it was now proven possible and taken as a central pillar of future plans. “Blitzkrieg” is thus more of a result than the cause of the Western campaign.
Besides this conceptual shift, it had two other effects. It vindicated Hitler, whose war strategy was, for the moment, proven right, giving him popular support and nullifying any resistance within the army and bureaucracy. And, to some level, it created overconfidence of what the Heer could achieve.