Adoption has two angles to it: acquisition and usage. Bitcoin ATMs constitute another option to strengthen the acquisition phase, so from that standpoint they do contribute to adoption.
Aside from regular ATMs, there are other initiatives that play their (for now small) role in the process of adoption. Panda Group is deploying in Colombia, and now in Venezuela, a portable version that looks very similar to one of those devices you use when paying with a card, but that allows you to purchase BTC with the necessary aid of a shop assistant in this case (no self-service).
France now sells BTC through tobacco selling stores. Starting today, Keplerk has deployed a solution in 5.200 points of sale, allowing customers to purchase a coupon with a facial value of 50, 100 or 250 Euros. These coupons are then used by the purchaser to, in his own time and place, load his Kepler Bitcoin Wallet by scanning the coupons bar code. I believe that the wallet is custodial, so not the best option, but the idea is to make it simple to purchase, rather much like purchasing a lottery ticket. Not the best of similes, but a means of getting to a different target audience.
Apparently, Kepler is not the first. Digycode deployed their solution first in around 10K tobacco selling stores in France using smaller coupons: 20, 50 o 200 euros. The coupon redemption process here is different, and is done through a website that allows you to send the BTC (or ETH, LTC, XRP, Dash) to a wallet address of your choice.
ATMs and solutions such as the above therefore strengthen the acquisition options of BTC, and each solution may attract a different target audience simply because of how the usage is actually implement. Legislation at some point will step-in to have its say, where it currently fall into the category of a grey area.