Lucy had potential and while CT certainly wasn't a strong an actress as the other cast members were, she certainly was a much more of a superior actress compared to the cast that joined post 1986.
Lucy needed to be on her own, away from both the Dallas & Californian Ewings.
Mickey was her best suitor, the chemistry between them was hot hot hot! They were a younger Bobby & Pam, and could easily have been the shows second big couple.
The writers had no real vision when it came to Lucy, in my fan fiction Lucy and Pam form a close mother/daughter & sister bond, yet also best friends, Lucy would be Pam's biggest defender and would even be tempted to betray the Ewings as a result, her reasoning would be that Pam was the first person who ever gave a damn about her apart from Miss Ellie, but she simply spoilt her whereas Pam laid boundaries to protect Lucy.