This event was like Disney presenting a mass-production rollercoaster you can pre-order for your home, but the general public seems to glance over how utterly irrational this is.
So far companies did alot of fundamental due diligence before making such an announcement (and the prior R&D investment!), because the consequences could be fatal.
The average consumer apparently still assumes that this due diligence phase was passed, thinking it's impossible that a known company presents something that big it cannot deliver on...
And also your point: It is a company presenting a jet-pack to actually sell a premium back-pack under the same name.
They invested in the engineering of 1-10 jet-packs, to sell 200-2000 backpacks...
The demonstrations seems to be very specific, it probably can't do anything more than fall to the ground. The practicality of actual levitating the car may out of reach.
Everyone calls it a "flying car" the idea is planted in people's mind and they let people's imagination or credulity do the rest. Stock price goes up.
Even if we would accept the premise that flying cars will be the norm at some point, I'm not sure what people imagine that would do for them. Technically you could solve traffic jams to some degree, but still not entirely because I can't imagine that at any point flying cars would mean that you just fly wherever you want. It would give us multilayered traffic, which is cool to reduce traffic jams, but does it really do anything else?
But prior to any of that, I'm fascinated by how irrational it is to think that this jumping car is even remotely feasible to participate in any kind of traffic.
That's why I assume that the general public expects that Tesla has already solved all these problems, as they otherwise wouldn't announce such a product.
In reality, we apparently have entered times where they could present a teleporting machine and start a 200k USD pre-order with little to no public scrutiny.
You can clearly see what it does. If nobody buys it or it can't be driven on public roads, so what.