Nothing against Liza, but I'd rather the role be played by someone who still has a strong voice.
"The gods who nurse this universe think little of mortals' cares. They sit in crowds on exclusive clouds and laugh at our love affairs. I might have had a real romance if they'd given me a chance. I loved him, but he didn't love me. I wanted him, but he didn't want me. Then the gods had a spree and indulged in another whim. Now he loves me, but I don't love him." - Cole Porter
They should just get Christine Pedi as Liza to play Hannigan. She plays the role as Carol Channing as Hannigan at matinees. And as Bernadette for the press performances. Merman and LuPone can fight for opening night.