Are you comparing the Pro to the S, or do you not think you would see a difference on Scorpio on a 1080p set?
Also, it isn't like Netflix has all (or even many) new releases. They also charge more for 4K streaming. Streaming rentals also cost more. You are also possibly going to have to increase your Internet plan. The benifits of streaming video is no different now than it was when Sony debuted the PS4 with Blu-ray. It seems a hell of an about-face for Sony to abandon the future of a medium that they started in the first place.
The Scorpio is over a year away. It is of no concern at the moment. Currently speaking, the S is the only competition, and merely supports a UHD drive, but that is all it supports. So if you don't have a 4K TV, what's the whole point of the UHD drive being of any use or an advantage to the system? Without a 4K TV, you basically have a vanilla system. Where is the extra added value? Now if you were to flip sides here and compared that to the competition, you'd see VR as that added value, and that doesn't take a special TV for that experience to be had. In fact, it doesn't require a TV at all. Here, is where that extra added value lies.
By taking it a gear up, you have Pro, which does this but better and again, without an 4K TV. Here alone is your extra added value. When a 4K screen is tacked on, that value is multiplied.
As far as digital, you are comparing a NOW experience to a later on experience. You forget, 4K is relatively new. Why would a plethora of content be on the market when 4K televisions have barely penetrated home? That doesn't mean more options aren't coming which also breeds competitive pricing. Sony obviously chose to go digital because digital is the future of content over the physical media.