In case you weren't aware, DVD's are only meant to last ten years or so. I've started ripping mine to the hard drive, something I've meant to do for a while, and some of them are difficult to read, giving errors, because they are dying. DVD just passed 20 years old and if you've got DVD's that are a decade old or more, you should consider ripping them, because they might not be readable in another decade.
As FYI, Blurays were designed to last longer, there's no guarantees of course, but Blurays and the new UHD Blurays should last several decades, you'll probably be buying everything in digital and streaming before your blurays die.
As a tech note, I'm using a custom build of the latest version of Handbrake that supports x265 Main10 (10bit), which is what I am ripping everything to. And I must say, its VERY impressive. Using advanced deinterlacing and 10bit encoding on slow settings/high quality, I'm getting files that look better than I ever thought DVD's could look (at about half the storage size of the original dvd). I'm serious, I'm all about the Bluray, HD and 4k, but with these settings I'm getting ripped dvd's that look almost HD. I mean, I'd never confuse it for a bluray, but it looks like a well encoded 720p file, its amazing to me that dvd can even look this good.
For instance: Fruits Basket is a wonderful anime, but it will likely never be rescanned in HD and released in HD, so the dvd is all we will ever have. Well, before I could hardly stand to watch it because I'm so used to Bluray now that the dvd quality was almost unwatchable. But using 10bit x265 with Bob deinterlacing, I've converted it into something approaching HD quality, which blows my mind.
(I'm mostly ripping dvd's that I don't think will ever get HD releases. I'm also tossing out a few dvd's that I know I'll never rewatch, so why bother ripping and storing it.)