I have a dumb phone as well, a prepaid cell phone. It's cheap and does the job.
But even if sales dip on e-ink readers, the demand for them won't disappear. Someone will fill that demand, if you want an e-ink reader, someone will sell you one. Much of the work has been done, the price of the e-ink displays has dropped because of how many e-ink readers there are out there. The Kindle DX was expensive because the demand as low. E-ink offers too many advantages to disappear.
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