I will agree that the crowds would be against her, hence, book her as a heel, at least IMO.
This is the same company that had Lawrence Taylor main event a Wrestlemania. It isn't about experience. This is the same company that pushed Roman Reigns and he has no personality. Daniel Bryan is only 5'8 in a world of giants and was one of the most popular champs ever.
LT was still pretty much a mega star during that time. It was also in the New Generation era during a time where they had one of their worst drawinf champions ever in Diesel. I think Bret was out on injury. They had literally nothing else. Floyd vs Big Show didnt main event their Mania.
And also, Roman Reigns is a tremendous wrestling talent. His promos need work (and just better booking overall), but he is a tremendous wrestler. Bryan was a tremendous wrestler and had an innate charisma about him.
See, you can usually get by in WWE if you have one of the three - charisma, wrestling ability, and size, though for size, if you suck so much in the other two it really doesn't matter (Khali). The most successful wrestlers have a combination, and even the worst in WWE usually at least have one of them, even partially. Otherwise, they're gone.
Ronda has none of those three.