If not MB then they can directly replace the character...no need to kill Ashu or show plastic surgery ... thats all old tricks to do,.
simply replace the character ... its all right.
just two days back they shown us that Ashu is ready to talk to Nidhi Baba and very positive and confident about the love relation...now if they show accident / death / plastic surgery and then present new actor as Ashu...till that time we will need to see sad and crying Nidhi all time.
Holi is coming up..instead of destroying positive things and happiness in the AshNi relation..just replace the character that all.