it would need to be ripped out and the disc player, receiver and projector replaced. I am not willing to spend $15k for the upgrade and will wait until the products stabilize and prices drop.
Personally, I had not planned on making the upgrade until later this year, but a couple events fell into place-
1. the Projector and a 4K UHD program source became available as of March.
2. 4K BluRay movies began selling at a reasonable price
3. I found an ebay auction to get the new Sony 665ES projector for $8600. Hard to pass that up.
If you buy the Samsung K8500 BluRay Player, you will also get a player source that plays the 4K UHD disks, and has all the apps for internet streaming sources and will play files from USB too.
The Samsung has a dual HDMI output to feed 4K UHD and lessor to the projector direct and display HDR content through hdmi input1, while also sending audio vis the second hdmi to your traditional AVR, eliominating the need to upgrade the AVR receiver. This can receive priority once you add a second 4K HDR program source to your equipment compliment. Other sources such as a 4K UHD server, or a 4K UHD satellite receiver when these come out.
The main problem today is the HDR color gamut handling by these new devices. Basically there are problems and the companies are scrambling to fix it through firmware updates. Until these issues get fixed, you either wait or operate with a crippled version of HDR so the picture looks natural. The good news is that even with the crippled version, these latest UHD TV's produce an amazing picture far superior in image brightness and detail than the best 1080p. What I found is the 2D and especially the 3D is jaw dropping better on the bigger screens than what I had before.
For those who are considering an OLED panel vs a DILA or SXRD projector-
My personal opinion on OLED is that I don't like the blacks on OLED. While they are very deep and really black, when I sit in front of an OLED TV I see a mirror image of me and my room reflection. I become part of the TV image. I don't like that! The projector has the same level of black depth but lacks the glossy, mirror reflection. But as a practical issue, a projector really needs a dedicated Home theater room for it to work. The OLED can be used anywhere. As for the other colors besides blacks, the newest projectors with UHD can look as saturated and bright even in full room light as the OLED. The older projectors with just HD limitation could never do as well.