For me, its a matter of still loving my Panny plasma and not being happy with the current sets out there. I'm waiting on OLED to reach better pricing but when they do, I'm onboard 100%. That's at least another year or two away for me so the lack of UHD BD player is a non-issue. I'm also waiting for the HDR standard to be finalized. That still hasn't happened and we may see dynamic HDR down the line which incorporates some of the stuff Dolby Vision is doing. I'm in for a Pro.
Nonetheless, it's a stupid omission and a "gimme" bulletpoint that Sony gave Microsoft for no reason. There's very little cost associated with adding support but I think it says more about how Sony feel towards the UHD Blu-Ray platform in general. Sony has been pimping their 4K streaming service a great deal and this is pretty much them saying they don't see UHD Blu-Ray as more than just a niche platform moving forward. Which is in and of itself a bit sad.