You make a great point. The whole reason that digital samplers were invented is for precisely the reason you state, analog sucks. Now if we look at how suckiness has created some of the greatest music the world has ever known, then you see why everyone wants more analog. Dirt, grime, distortion, noise, all things that we just adore.
So with that said, I would like to say that all of the above examples of analog sampling have some use. The Melotron was the real thing though in terms of actually being a genuine usable analog sample playback device.
So if you want something to store an analog sound in high resolution, you are really going to have to go back to the drawing board and start all over trying to figure out the best medium to store waveforms on that is truly analog, or linear.
Tape sucks, vinyl sucks, BBDs sucks, but we love them all. What other ways can we store a voltage or a representation of a signal that can be converted back into audio? There are not that many ways to do this. Light is not something that we can use because it moves so fast that you can't slow it down. You can modulate light, but what does that do for you? What things move slowly that we can impress and image on, or mecahanically impress a signal onto it's surface, or magnetically impress a signal on it? You might use thermal printers to drop a waveform on a paper loop.