Fiz has fallen for Tyrone Dobbs in recent months, but the pair currently have most of the street against them thanks to the twisted lies of Tyrone's ex-fiancée Kirsty Soames (Natalie Gumede).
In an interview with TV Times, McAlpine explained that settling down as a happy family may not be on the cards for Fiz and Tyrone in the long-term.
"That would be lovely, but you can never settle in this job," the actress commented. "You've got to have a bit of conflict - that's what people tune in for. I think viewers are behind Fiz and Tyrone, but I can only see a rocky outcome.
"It's funny because everyone loves Tyrone, so if Fiz hurts him, they'll want to kill me! He'd better not upset Fiz, either, or there'll be trouble!"
She continued: "I think there might be a lot of crying on the horizon. They've got too many obstacles to overcome - and not just Kirsty. What if Cilla came back? And Chesney's not impressed either. Then there's Tyrone's mother. The list is endless!"
Alan Halsall, who plays Tyrone, added that his character's desperate desire for custody of his baby daughter Ruby could also prove problematic.
Tyrone tries to flee Weatherfield with Ruby next week, but his antics only make the situation worse.
Halsall said: "It would be nice for [Tyrone and Fiz] to have some stability. They've both got children and crave that settled family life. There's a genuine love there, but there's a huge stumbling block in their way. At the moment, Tyrone's priority is not Fiz - it's Ruby. She's his driving force."
Coronation Street continues tomorrow (February 1) at 7.30pm and 8.30pm on ITV. Get the Inside Soap magazine on your iPhone or iPad