What is the fate of low end Win10 Mobile phones with the future being windows 10 on ARM

I use a Lumia 540 , not the best phone but it serves me well in a country like mine (Zimbabwe). Now i don't plan to keep it forever but this has made me wonder if such phones will exist in a world where high end phones are running full Win10 on ARM whilst low end ones will apparently be as powerful as the Lumia 950. Now i know hardware gets cheaper every year but does that mean that really cheap windows phones will never exist (ones that go for less than $50 in America for example)

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