Well until then we will all just have to accept the idea that all these different things are still in a state of flux and haven't settled to a common technology. As good as eink is for reading, especially outdoors, we are likely 5 years away (as you say) from having the ultimate reading technology. Until then maybe we can agree to have our iPads, Kindles, Nooks, and Tablets and be happy about it.
P.S. Currently reading
Brandon Sanderson's "Way of Kings" on my netbook while watching football and reading this forum. Great book so far - I highly recommend it!