Bungie has no reason to update Gambit, neither to remove it. Gambit has been abbandoned for years now and with the fact that in the state of the game before the launch of Lightfall it wasn't even mentioned, it is implied they have no interess to take care of it. Also, any effort towards Gambit would be a waste of time, money and resources because it would be added as F2P contents, which means Bungie can't monetize it (exactly as new PvP Maps or Strikes). At the same time, why remove it? It is still "something" more to do and keep players busy somehow through Seasonal Challenges ecc. It's there, who wants to play it can do it and that's it.