They will need to rebuild their account through a friend's Microsoft or Playstation account to avoid the barrier, or get one (I think a 360/PS3 should be less than £100 by now, and Taken King is £50, and the subscription for online access yearly is about £25, coming around at tops £175, which is much less than an Xbox One/PS4). If they don't have those funds, or friends, they'll have to build groups and access the unofficial #s.