Consider the lowly mp3 player. yes, we can all put our music (or audiobooks) on our smart phones, but the mp3 player has much better battery life, and so they've stuck around, although as a niche item. Even Apple still makes an iPod Nano, and you can buy not contemptible ones for $35-$50.
Similarly, I think there will always be a niche for b/w dedicated ebook readers. We may stop seeing much change in models year to year, as the technology (and expectations) mature, but I can't imagine them going away completely. I mostly read genre novels, no magazines or comics, and don't need color. You don't see regular pbooks printed in color (unless there are illustrations, and even then mostly they're b/w), even though we've had color printing for decades.
Between not needing color and the longer battery life, I think we'll see dedicated ereaders around for a goodly long time yet. (i hope)
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