A lot of people in the home theater community own PS and Xbox systems or run PC's to their projector's. So even if the content isn't there yet, they want the tech to be there.
Which leads to the other reason people want it, because It's New! haha why pay $6k-$30k for a projector if it's not going to have the latest tech on the market? When your $5k and under projectors are including tech that your $6k+ projectors aren't, I think that's a problem.
The reality is that this is still a choice for a lot of buyers. And at least they have a choice.
Sony failing to include certain features, was a choice. People caring or not caring is also a choice.
Epson has delivered greatness for many years from their LCD models, but they've remained LCD projectors. So, people have a choice.
If you want 120hz support with 4K, if you want HDMI 2.1, if you want motorized lens shift, if you want DTM, if you want a motorized lens, if you want the best image, if you want laser...
Then Epson can't deliver, and Sony can't deliver, and you are buying a RS2100 from JVC at the very least, and it isn't going to be $5,000 or $6,000.
At least we have some more choices this year. It will be interesting to see if DLP/Texas Instruments responds in the next 12 months at all with any mid-tier options to compete with the upper tier solutions. I could see a half-4K chip which introduces 120hz 4K support. Maybe. But, for years DLP has been racing to the bottom or the ultra-high end with little greatness in between. A shame because a really good mid-tier chip would stir things up some.
At this point. Epson's upper tier is making a serious stab into what Sony and JVC offers.
But, if a end-user is buying a projector strictly for movie/TV watching, no gaming, and has a 16:9 screen (or motorized A-lens), then these Sony models, especially their entry level 5000ES, will be serious hitters.
Not to mention all those who just go in clueless at Best Buy and get the Sony because it is a Sony so it MUST be a great product.