JackOfAllTirades
Explorer
If and when I decide to run 5e, I would not allow it based on the current subclasses (This might change when new origins come along). I also will not allow Path of the Totem Barbarians, Circle of the Moon Druids, Champion Fighters, Way of Shadow Monks, Way of the Four Element Monks (if I run a setting where this is fitting, I will use a different system), Oath of Vengeance Paladins, Fiend Pact Warlocks (NPC only in my campaign), and Great Old One Pact Warlocks (if my campaign had Great Old ones, it would be an NPC only class with characters eventually going insane or being destroyed by the knowledge).
Are you sure you're running the right game to begin with?