I think there is a misunderstanding here about the "lose their job" part. This is not about a factory floor worker getting fired for buying the wrong brand of car (they might even take public transport to work), it's about a general fear that if the car industry breaks down, everything breaks down. Imagine how people in silicon valley would feels if there was a risk of all forms of electronic communications getting phased out. They might be quite reluctant to adopt that newfangled form of messaging by avian carriers that some Hogwarts company is bringing to market.