if Wentworth hadn't come to Bath and she had not become reacquainted with Mrs Smith?
Just reread Persuasion and really enjoyed the development of Anne's friendship with Mr Elliot this time round. I know he has dubious morals but I think he actually valued and would have loved her had she accepted him. Obviously Wentworth was perfect for her, but I think a romance with Mr Elliot would have been an Austen worthy novel in itself. She would have finally got the status in the family she deserved, gained her father's admiration, married the man her sister Elizabeth felt entitled to, taken her late mother's place in the family at Kellynch Hall, and Mr Elliot would (hopefully) have been a better man and loving husband as a result of Anne's good influence on him.
Although Anne initially thought she could never marry Mr Elliot, her feelings for him were softening until Wentworth came back to Bath and completely dissipated once Mrs Smith told her the truth about his character. IMO if it wasn't for those two events, there is no way she would have resisted his charms for long given the suitability of the match to everyone concerned. As it was, Mr Elliot's involvement was just a literary tool for Wentworth to finally recognise and act on his feelings for Anne and for Anne to realise the value of own judgment and show character development in resisting being persuaded by Lady Russell's desire for the match. BUT he could have been so much more...
YANBU - yes, she could have been happy with Mr Elliot and secured her whole family's future
YABU - it was impossible for her to be happy with Mr Elliot - she would always compare him with Wentworth/ he wouldn't have been a good husband to her.