Yes, Every member of the PF family will pay for it including Dev and Rad's too. He didn't have enough faith in his wife and someone in this post did talk about Sitaji and how that is unforgivable-agreed!
But sharing your husband after promising to be there for each other when going around the fire during the marriage is not forgivable either. Yes, she did it for the community but there is something to be said about how seriously/ or NOT she took her marriage.
If we are comparaing Dev's love to Rads based on his actions, then I'm left wondering about Rad's love for Dev.
Rad's wants to be there for her family and share her husband for the sake of the community-she was trying to sail in both boats and hence she is paying for her sin and so will Dev!
They both will understand that you can't have a 3rd wheel it never works (knowingly or unknowingly) lol
These mistakes RaDev are making also goes to show that they are not perfect hence human not God :)
Talking about punishments for the PF family, what about Rad's step-mother and sister? They need to be taught a lesson too!