It's already pervasive:
1998:"Face-recognition CCTV launched" http://www.independent.co.uk/news/face-recognition-cctv-laun...
2015: "A scheme widely used by UK stores to identify criminals is testing facial recognition technology, the BBC has learned." http://www.bbc.com/news/technology-35111363
2016: "Retailers are increasingly using facial recognition technology to track your face. With an estimated 59% of UK fashion retailers doing it, is the anonymity of cities an outdated idea?" https://www.theguardian.com/cities/2016/mar/03/revealed-faci...
2014: "UK, the world’s most surveilled state, begins using automated face recognition to catch criminals" https://www.extremetech.com/extreme/186435-uk-the-worlds-mos...
2014: "CCTV cameras on Britain's roads capture 26 million images every day" https://www.theguardian.com/uk-news/2014/jan/23/cctv-cameras...
2017: "New York plans to install vast system of facial recognition cameras that matches drivers licenses to social media accounts at bridges and tunnels " http://www.dailymail.co.uk/news/article-4167854/New-York-ins...
You can google for more, watch out for those black helicopters tonight.