I don't believe rvpiano is making claim cd's and lp's worthless in general, rather worthless to him. I'm in pretty much same boat, well over 7k cd's and vinyl, trying to determine fair value entails so much work, daunting task. Yeah, I could sell in batches, guessing at values of many within that batch, may screw myself by greatly miscalculating a hot stamper or other unknown to me valuable record. Most of my vinyl is likely first generation releases, having been purchased back in the day, I've found a couple worth some real money in doing research on just a few.
I like the idea of giving cd's to library or some charity.
I doubt many of us streamers will ever go back to physical media, once your streaming sound quality has equaled or exceeded cd over transport, that's done with. Vinyl has better chance to remain in my system although rarely used, I have to admit vinyl does have it's unique value for me. I do need to cull the herd on vinyl, takes up far too much space, and my taste in music has changed from when most were purchased.
Following on last sentence above, a great limitation of physical media for me is my tastes in music change over time, media remains static, media I no longer play becomes obsolete. Streaming dynamic, leads me down many paths towards new and exciting music.