I don't think fans would care that much if she doesn't face Ronda. It wouldn't be ideal if they didn't do something with those two but it's not like they'll leave becky off the card.That's the thing, as of right now it seems like Becky might not face Ronda at Mania, which could cause a Bryan-like uproar by the fans.
Personally, I think it's too early to draw any conclusions. My guess is that they are gonna book Ronda vs Charlotte vs Becky as the WM main event.
If anything it'll probably be that triple threat match but the question is how do you get there especially if neither Charlotte or Becky win the rumble.