No update is bringing people back at this point. You'll see a slight bump, but ultimately the layers of bad design (ordnance, AAs, missing gametypes, flinch, etc.) will frustrate everyone again and the numbers will continue to decline. These changes might open up the game to a more exciting competitive scene, but again that most likely won't lead to a surge in average players.
I'm glad 343 is making wholesale changes and essentially admitting the base game needs a lot of work. That shows promise for the series going forward. I only hope that Halo 5 isn't too far down the road to incorporate massive gameplay mechanics (like removing AAs from multiplayer).
