I find the video too optimistic, much too US and Boeing centric. The 757 is exactly the kind of plane that was possible and profitable in the past,
that would be an abject failure today, costing billions upon billions of losses to the manufacturer that would attempt it.
If they can only expect to sell some hundreds, and it's a narrowbody so not the same kind of money that a widebody brings, then it must be cheap to design => it must be a derivative of another plane. Even then, I'm not convinced there would be an engine for this, or the manufacturer would have to pay an engine maker.
If they expect to sell several thousands, they must prove this market exists.
Similar phenomena in telecoms where one of many reasons VoIP phones connected by ethernet were favored because they got rid of one run of cable to each desk, even though the phone itself was a lot more expensive than a 'dumb' phone. Any time you get the 'trades' involved it's going to be expensive.
My company is in construction and in telecoms too. Construction isn't going anywhere, and at least in my country and many around the world (including the US where we build infrastructure from time to time) there is a will to build and maintain infrastructure.
I've just learned that the TV group also owned by my company is going to trial floors of "offices" with no actual offices, and no network cabling at all : all WiFi, with softphones on the laptops of people who still want a "landline". Several of our biggest clients, including ourselves, are getting rid of deskphones or are planning it for the next few years.
New Technology is the name we give to stuff that doesn't work yet. Douglas Adams