Open Extended ReactionsSAN ANTONIO -- Mitch Johnson extended his hand. Gregg Popovich introduces Mitch Johnson as the Spurs' new coach, saying "it's time to make this change." "That's the goal, to make sure we keep it going," Popovich said, adding that he will do everything he can to help Johnson going forward. Johnson took his seat at a microphone moments later, not before Popovich reminded those present that "he's going to do a great job." Johnson took over as acting coach for the final 77 games of the season and his promotion was formally announced Friday.