I would expect it to be higher than 71%. However, considering how every millenial and gen-z (the biggest consumer of phones) find they can't live unless they have the next (trivial) incremental update to a phone then from a carrier perspective there is no urgency. Especially since the next phone should have the latest android release that includes the latest security patches -- the one they would use prior to filling it with their bloatware.
Also, lets not forget that these largest consumers don't care much about their stolen privacy since they share it regularly on FB and other social media. There was a story where a bot could identify people with 80%+ accuracy solely by their publicly available social media posts.