The current Broadway environment does not cultivate stars like Merman. She came along when they wrote shows around specific stars. She appeared in 15 Broadway shows. Only one was financilly unsuccessful and even that show ran a full year.
Bernadette Peters has so far done 10 shows. I think Peters is a better technical actress and when te score is tailored to her unique voice she can be dynamite with it. But she is not a modern Merman. Nor would we expect her to be.
These ladies along with Martin, Channing, Andrews and Verdon are all unique talents that can never be replaced.
Cast albums are NOT "soundtracks."
Live theatre does not use a "soundtrack." If it did, it wouldn't be live theatre!
I host a weekly one-hour radio program featuring cast album selections as well as songs by cabaret, jazz and theatre artists. The program, FRONT ROW CENTRE is heard Sundays 9 to 10 am and also Saturdays from 8 to 9 am (eastern times) on www.proudfm.com