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The chances of e-ink dying out are pretty slim. E-ink is still a young technology, it's application is a lot broader than e-readers. LCD monitors are commonly used to display static images, and e-ink is better at that. The downside to e-ink is that color is not yet as good as LCD. When color is improved, e-ink will an obvious choice for displays - you don't have to spend the energy to display the image. LCD is also has a much better refresh rate. Once e-ink improves both the color and refresh rate, an e-ink tablet makes a lot of sense.
As long as there are people who want to buy e-ink readers, someone will produce them. With 8-track, as people moved to cassette, there was less demand for 8-track tapes, so there was less incentive to release music on 8-track, which lessened demand for 8-track players. It's different with e-readers because unlike 8-track and cassette, the format of the content is identical. Decreased demand for e-ink readers doesn't result in less content that can be used with e-ink readers. Even if E-ink doesn't improve significantly (which I think is highly unlikely), people who want e-ink readers will be able to get content for them.
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