I'm pretty sure there's a thread with some thoughts about Barbara Cook's Fanny Brice around BWW.
Discussing the commercial prospects of an Ambrose-led FUNNY GIRL is pretty moot since there are so many factors at play. We don't know if she'd have earned starmaking reviews that would have turned the show into a respectable hit in the style of a few dusty revivals that seemed like poor commercial prospects at the time they were announced (HAIR, PIPPIN, WONDERFUL TOWN). I'll always be disappointed that this didn't come to fruition as it sounded like such an interesting idea and Ambrose tends to be so spectacular that I really think she'd have made it worked. I wish they had gone the Encores! route or tried it out at a non-profit of some sort, since I imagine the issue getting investors had a lot to do with how difficult it was to imagine the show with her in the lead.
"Some people can thrive and bloom living life in a living room, that's perfect for some people of one hundred and five. But I at least gotta try, when I think of all the sights that I gotta see, all the places I gotta play, all the things that I gotta be at"