Rupert Grint, Emma Watson, and Daniel Radcliffe behind the scenes
Emma NEVER said Romione wouldn't work. During the entirety of the movies filming Emma was 100% Romione supporter. She would always bring it up. She would always correct interviewers when they downplayed Ron. In the "infamous" interview she was on Ron's side much more than JKR. (And when she said "some people thought they wouldn't last" she wasn't talking about it being HER opinion, she was saying what Some FANS have said, which is true Some fans have said that. But Emma Watson never gave up.