I would hope that the increase in the sale of eInk ereaders was helped by Walmart's entry into the market in mid-2018.
http://straussconsultants.com/walmar...aders-selling/
I'm not certain how many of the brick & mortar Walmart stores have the physical readers available to touch, but being able to see an item in person can influence a buyer to purchase one. The ability to return it to a store can also be an incentive. Due to the cost of postage, the US Kobo online store disallows free shipments to Hawaii and Alaska. Yet, Walmart did not enforce a lockout, and I was able to get a Libra 2 with a gray cover.
Back in the first decade of this century, even BestBuy was carrying eink readers. Now they only sell products by Amazon and Boox. While it is nice knowing that eink readers are still being made, I'm still worried about the non-Amazon ones becoming extinct.