If we don’t find out they are connected in some way by the 50th anniversary, I’ll be really surprised.They missed an important connection. Clara’s mom died the day of the Auton Invasion in Rose. The day Rose went away with the Doctor for the first time.
And the Ghostbusters thing. I don’t know whether I think there’s a connection between the two, but there were definitely a ton of references to Rose throughout series 7b.