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I meant limit in term of refresh rate and bit depth, which haven't changed much. The resolution as I understand it can always go higher because eink does not have pixel in the usual sense, or at least the number of addressable pixels is very high. They just need to have the requisite controller.
It doesn't mean we won't see ANY improvements. In just mean we're not likely to see a breakthrough that'll make it a viable alternative display for general devices.
Btw, lcd has also pretty much reached its limit too. That's why there is a lot of excitement around OLED, which people are hoping will supplant lcd.
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