How much is left in Dirk's tank?

If the rebuilt Dallas Mavericks are going to make the playoffs in 2013-14, it's not going to be because of all the new pieces -- it's going to be because Dirk Nowitzki led them there. But coming off a rare injury-plagued season that limited the 35-year-old to 53 games, does the Mavs' leader and future Hall of Famer still have what it takes to make that happen?