i beleave blu-ray is a dead format, a 2TB harddrive might cost $60 and can hold 40 blu-ray movies(dual layer), i would say it's a much better solution if you want to have a copy of the film. i beleave blu-ray quality streaming isn't that far away either. i guess blu-ray had a point 2006 when hard-drives where much more expensive per GB and internet much slower.

40 layers and 250GB per layer would result in 10TB of maximum storage per disk which would be enough for even 3840*2160 without lossy compression.