It's untrue that Wall hasn't led the Wizards anywhere. Without him, the Wizards are awful. With him, they're a borderline .500 team. From his summer league production, I'm not counting on much from Porter, but Beal is super promising, and Nene/Okafor is a underwhelming, overpaid, but serviceable frontcourt. All of them have injury concerns, but if they can stay healthy the Wizards can definitely make some noise in a top-heavy East.
That being said, I would not choose Wall over Rondo. Honestly, when it comes to Rondo, I hate saying this but statistics go out the window when it comes to him. Rondo's effort is frustrating to say the least during the regular season, but he still plays good enough to get a decent team into the playoffs. Once he's in the postseason though, he goes into beast mode. Seriously, come playoff time and there's no other PG on his level outside of CP3. Hell, to me Rondo is a top 10 player in the league when considering postseason performance only.