Bravo needs to show he is clearly better than Hart, there is nothing controversial about that. If he isn't clearly better, then what was the point?
If he makes mistakes like that free kick vs Betis, fans will not be happy about one of the most popular players being forced out. Pretty straight forward really, if he is brilliant then people will forget about hart pretty quickly. No one is crying out for Mangala or regretting MDM leaving because Stones' performances have been top notch, Bravo's job will be considerably harder replacing our longest serving player and our 2nd/3rd best player last season.