Lot's of Bitcoin ATMs keep popping in the developed countries such as US, Canada, Japan, Hong Kong etc. But I have been thinking why don't the owner's target countries without much economic stability? Like Venezuela (btw they just got their
first Bitcoin ATM). That would increase the adoption. Something like backpropagation. What do you think?
If you are talking about the major population of the developing world, then you might be talking about 1-2 Bitcoin ATM's in every major city. There won't be demand as most have no money to gamble on Bitcoin.
Still I've noticed in google trends a few countries (as Ghana and Nigeria) having increased interest in Bitcoin. Perhaps the companies that install them can survey the interest in these countries and install a few as a test.