It's so tempting to get a 4K TV now that the prices are good. BUT, my 3D TV looks fine, and I have a bunch of 3Ds I haven't watched yet. I have been forward-thinking and buying 4K/Blu-ray combos if the sale price isn't much more than the Blu-ray alone.4k tellys are getting cheaper all the time, they'll be falling out of your morning cornflakes packet soon (if the packet was big enough).
. . .I still have all my DVDs here, hiding behind my blu-rays, I have deep shelves. They do get played occasionally, I don't have every film on blu-ray.
A while back, I placed most of my DVD discs in paper sleeves to save room. Saved all the cover art and threw away the containers. It just took up way too much room otherwise. Kept the originals as is for ones with special packaging. I have quite a lot of digital content now for convenience and to save space.