Events of 8.4 Listen could still come back to bite Doctor and Clara in the proverbial behind. 
For sake of argument in a different timeline Clara married Danny and had a family with him. Including a grandson or great grandson Orson Pink.
Danny's tragic and early death
meant things have now changed. There has to be consequences a family bloodline just destroyed. Pinks who were suppose to be born now don't or won't exist.
Clara and Doctor might discover the consequences of this. Forget paradoxes ,timey whimey or fixed points. Simple choice a chance to go back and put it right.
Clara says her farewells to the doctor he sends he back to the day she lost Danny.
Clara saves him and gets her happy ending. Timelines restored Orson Pink continues the family line. Everyone is happy. Doctor is sad to lose Clara but know she is where she belongs with the man she loves.

For sake of argument in a different timeline Clara married Danny and had a family with him. Including a grandson or great grandson Orson Pink.
Danny's tragic and early death
meant things have now changed. There has to be consequences a family bloodline just destroyed. Pinks who were suppose to be born now don't or won't exist.Clara and Doctor might discover the consequences of this. Forget paradoxes ,timey whimey or fixed points. Simple choice a chance to go back and put it right.
Clara says her farewells to the doctor he sends he back to the day she lost Danny.
Clara saves him and gets her happy ending. Timelines restored Orson Pink continues the family line. Everyone is happy. Doctor is sad to lose Clara but know she is where she belongs with the man she loves.







