For me, because of the increasing acceptance of bitcoin, that's why bitcoin ATMs are now widespread. Also, it makes it very convenient for those ppl that are using bitcoin, and also it can attract many ppl to try/invest bitcoin and do some research & study about bitcoin like giving them a curiosity about bitcoin ATM's. I'm looking forward to bitcoin ATMs to entice more investors and to grow this community. 
a widely adaptation of bitcoin in different country makes it as a good business , having a bitcoin ATM machine dealer bussiness will be a hit in the market now, it can be a good demand in each country, and yet it is needed to be secured,we know that ATM machine is kinda tempting for hackers too so it could be very secured, all the keys must be hide to intruders on the software of it.