Don't really care how it happens (abortion, miscarriage, whatever), just don't want to have watch Maggie go full-term with this thing. Aside from the purely selfish reason of not wanting to see Lauren Cohan made up to look all fat and gross, the show already has a baby. It doesn't need another one.
My wife and I joke about Judith. It seems like they use a new baby actor every show, and she is really more a prop than anything.
I'm not a reader of the comics to know her importance in the comics, but she seems like a complete waste of space in the show. She is never in jeopardy, she hasn't been important to any of the plot points since they had to go on runs for formula, so why bother? You would think they would have just killed her off when the prison fell.