you are right @LA2725, the damage cannot be undone. Seeing Abhi accepting TAnu as his wife in public (whatever might be the deal, but again, Tanu indicating she is the babhi to Aalya in private makes it sound true) has sealed the fate of Abhigya. Till now, we bore with all the crap because we knew the bhagya and kumkum position will remain Pragya's till the end. Even it is still hers, the fact that Abhi has accepted TAnu in her place even for namesake is not going to justify anything.
Abh has not searched or confirmed whether Pragya is alive or not (again this might be changed per writers wish and shown in FB as something different). I read in the serial gossip that after seeing Abhi and King together Abhi will act being married to Tanu to cause her more pain and another thing which is really going to make the viewers hate Abhi more if indeed it is true is that he will term Pragya characterless. In a way, this is butchering of both characters, Abhi and PRagya. The writers are creating bigger and bigger mess. When Abhi can kick out a wife without respect and then marry a characterless woman and glorify her, this part alone, how is Abhi going to justify to PRagya if indeed he wants her back in his life. Will he not just die with remorse for the 7 years they have lost, already the 4 years cannot taken to be 4 whole years of their lives, so another 7 is indeed another blunder by the writers. And by making Pragya suffer almost 11 years of married life, if the writers again make her cry and suffer in pain post leap, then all that is going to turn against Abhi only.