Well, there are several pop stars that have proved that you can succeed without a personality. However, the biggest factor is that he'll be alone. He won't have the comfort of relying on the other guys to take the attention. The whole "Zayn has no personality" thing is a myth to be honest. (has his dancing videos not been proof enough? lol) I'm just saying that he could change and adapt to a new solo life.
I hope Harry flops. A boy can dream, can't he? 
