For those of you asking about Mickie James following her match with Asuka at NXT Takeover: Toronto, her deal was for a "one and done" match but there has been talk of bringing her back for live events. Triple H did an interview with Cathy Kelley following Takeover and said that the ball is in Mickie's court on whether or not she would be offered a deal so it certainly looks like the door is open for her to return on a full-time basis.
She is only 37 years old and she can still go in the ring. I would argue that the match with Asuka was one of her best matches so she definitely has a lot left in the tank. People backstage were praising her work so I wouldn't be shocked if she was offered a deal to return or at least offered a backstage role to help the women at the Performance Center.
As you can see in the clip below, Mickie was emotional following her match with Asuka: