My perfect ereader won't exist for several decades since it would require radical advancements in display and battery technologies.

A realistic alternative would be (in my opinion) the best features from Amazon, Kobo, and Sony: start with the Kobo Aura HD's mainboard and display, add the Kindle 2i's keyboard and paging buttons, then throw on Sony's software. I'd also be more than happy to see the storefronts disappear.