My thinking goes like this. Scorpio is out in 1 year. And will be several times more powerful than PS4/Xbox One and 30-40% more powerful than PS4 Pro. Might as well not waste any money on any other console and put it all towards Scorpio.
The TV situation is still working it's way out and I will wait a couple of years until an acceptable model is cheap enough.
So I would be playing Scorpio on non-4K displays for a bit but I am OK with it.
Although I'm really hoping there will be an affordable 4K HDR monitor by next year.