Wouldn't surprise me if there'd be a viable market for such devices brandnew. Not just for nostalgic greybeards, also younger folks unfamiliar with yesteryear's tech & curious about it.
I like old tech too and in the 1990s I recorded a lot of audio stuff straight from the radio, but nowadays with USB everywhere I just would not use tapes anymore. I just find USB sticks so much more convenient. I kind of transitioned into the digital world only and while no transition is perfect, I feel that the trade-offs are in favour of digital only rather than audio.
Even listening to the radio is different, I'd just use mpv and record the stream into a local file, as-is. It is strange how new technology obsoletes old tech but I also don't want to go back anymore. Though old hardware is cool, I love old computers from the 1970s and 1980s. They are so much cooler than the modern computers, even though the modern computers beat them performance-wise with their eyes closed.
Poor fidelity of cassette tape medium was the least of the issues. The biggest problem was the built in mic's inability to handle the overall volume.
Lots of experimentation with placement of the recorder (and thus mic) within the rehearsal space would eventually yield results that were no longer useless -- but still pretty, pretty bad. I do not miss cassette.
To be honest I don't really even miss analog -- but this comes to down convenience and flexibility rather than fidelity comparisons.
Said another way: there are no analog DAWs (a redundant and captain-obvious statement, I do realize).
Instead, it’s just… a tape recorder connected, in a somewhat convoluted way, to spotify.