'What about if I backed up the 4k discs to my HTPC' they havent released a uhd br player yet as far as I know, but you would need one to go into your pc.'
Converting it down to 1080 will cripple all the visual goodies that uhd is meant to supply.
But at the end of the day if you can afford a uhd player and the disks, buy a 4k tv.
Found this:
At the same time, the industry has acknowledged the shifts in viewer habits with an Ultra Blu-ray feature called "copy and export." As its name suggests, copy and export lets you make a bit-for-bit copy of an Ultra HD film or program and store it on an authorized hard drive. That means you can probably expect to see Ultra HD Blu-ray players with 1TB or more hard drives.
Using the export feature, you'll be able to transfer a file—presumably a lower-quality version of the content—to authorized mobile devices. But you can't transfer it directly on your own to that device; it will have to go through a third-party service such as Vidity or UltraViolet. Both the movie studio and the player will have to implement this feature for it to work.
And
Earlier this week, Panasonic announced it would ship its first UHD player, the $3,000-plus UBZ1, to stores in Japan in November. There are no firm plans for a U.S. launch. Samsung previously reported that its first UHD Blu-ray player won't arrive until 2016.