Mobile friendly - Sub domain after responsive?

[Digitics]

My client has a mobile website (m.website.com) and is working on a responsive website.

The site is already labeled "Mobile friendly" on the SERP and I was wondering if, when the site will be responsive, it would be worth it to redirect the subdomain or it would be safer to keep the subdomain and still redirect mobile users to it since we're already Mobile friendly (we would keep the rel alternate on the main domain and the rel canonical on mobile).

[RyanPurkey]

To make it a little less of a coin toss, if the responsive site is delivering an even better user experience than the mobile website, redirecting the subdomain could be a benefit. You'd want to have solid split testing data from uniform groups of users, but if the directions point to responsive over m.website.com it could make since to go with the responsive site as the sole experience.