CESC FABRAGAS GOING TO FC BARCELONA A REAL MISTAKE ?

The positions between FC BARCELONA & ARSENAL FC are getting closer & it looks that the transfer of the Arsenal Captain CESC FABREGAS is close & soon to be shut. Its taken three years of on-off-on bargaining & strategic planning to get the "prodigal son" back to Barcelona. However the question is , does Barcelona really need Cesc? Or a bigger question for the future of Cesc Fabregas, is FC