This will happen for now because of some reasons I want to highlight here.

1. Bitcoin transaction fee with using its ATM is high and many will rather consider the comfort from their mobile device than using the ATM machine for making a transaction.

2. We can also consider the adoption and regulations over bitcoin and crypto at large by some countries as one of the major determining factors hindering the demand for the use of bitcoin ATM as some may require government approval before installation and do on,but only for countries like El-Salvador and others where Bitcoin is being supported by the government may have increasing demands on the use of bitcoin ATM.