Well this is pure hypothetical scenario which is less likely happen in KKB..
What if Abhi finds out real Pragya during KC .. Abhi confronts Prags , they fight then kiss and make up..
They go far from MM and celebrate KC and come back to MM as Abhi and Mugambo..
Next day Pragya annouces Tabhi wedding , And Abhi announces that he voluntarily give whole property to Pragya and some share to Dadi . And he will leave MM to go to a separate one bedroom house after marrying Tanu..
Tanu is dam disappointed at Abhi's announcement and resort on Nikhil for help . They plan and break Tabhi marriage and Tanu goes with Nikhil and Takhil lives happily in hell ever after leaving us and Abhigya in peace..
I guess.. I should keep dreaming