You can't cram vinyl into a CD player, it's a physical impossibility. Also, they are both standards used by many people. What you are missing is, most of these digital formats can be used on any tablet or computer. They just won't let you. RCA did not key their records to only play on their players and then litigate anyone who try to be compatible (look up when Real tried make Apple music play on their devices). The difference here is DRM which is causing vendor lock in. The ibook,epub, AAC, mp3, mobi, mp4, you name it, all of these will play on any recent hardware IF they are not encrypted and locked by the publisher. Sadly, they often are. It's vendor lockin, it's anti-competitive, it's bad for consumers and you can't post solutions because in the US laws have been passed under the supervision of large copyright lobbies to make any recourse illegal. So, no, it's not an 8 track. If it was, it would be an absolute impossibility (physically and electrically) for my devices to display the format, not simply Apple (or whoever you want to say is pulling the strings here) choosing to stop me. If you want proof, look at your own "solution", if someone can get an iBook onto a Kindle without printing it and scanning it, that proves my point. Try making that record work in your 8track player without re-recording it, I think you will find that much more interesting. I am not just trying to be contrary, I just think many people can be fooled by your flawed analogy and not see how truly messed up and unnecessary these incompatible formats files are (the formats are acutally compatible in and of themselves). Unless you consider "necessary" to always mean bottom line at the expense of your customers, then, I guess it's just fine.
Also, let's not forget that you always owned the vinyl and could resell it. If you still had it, you could sell it for a premium to those collectors you mentioned, you can't resell your iBooks and if Apple stops supporting them, they stop working. Plenty of other services like this have shut down, and the (for example) music people spent all that money on, just stopped working because they could no longer talk to the authorization server. This is in sharp contrast to your records which will only die from damage and not because someone went out of business, or lost the right to publish something.