As much as Daryl has been a lone wolf for much of the series, he has stepped into a leadership role when required, and one would think that he’d take on more responsibilities if Rick is on his way out.
Then again, Rick will likely be around for at least most of the first half of Season 9; Daryl’s increased role may not go into effect until the second half.
Angela Kang did not mention Daryl in her comments about leadership in Season 9 during her chat with EW, which strikes me as somewhat odd given that Norman Reedus will reportedly become the show’s leading man after Andrew Lincoln departs.