I doubt Kobo is going to replace the Elipsa just yet, it's just over a year old. And 73 dpi alone probably isn't enough of a push for them to scrap it.
That extra 0.1 inch is not insignificant either, and will likely have a bigger impact than the 73 DPI difference unless you're doing some graphic heavy work. Which would probably be done better on a tablet anyway.
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