"If you don’t have a copy of WordPerfect 2 around, you’re out of luck."
Dunno about WP2, but my copy of LibreOffice purports to open WordPerfect files of indeterminate vintage, and there are various other formats in there that I know go back 20+ years, and I'll be very surprised if ODF 1.0 readers disappear between now and eternity.
And of course, for us English-only types, plain ASCII files work as well now as they did in the 60s. I expect UTF-8 will likewise work at least as well in 2050 as it does now.
Physical media degradation/obsolescence is the only thing I would worry about, and then not that much for anything that's already been brought into the Internet age.
Storing lossless encodings of every film ever made might be a challenge, but text? No. A little care is all it takes, and I do mean a little.