I agree...This would be perfect for Encores.
The original play is so powerful and beautifully constructed. The authors of the musical didn't add anything of value, just inserted songs that just repeated what was already there. It had a long run but did not recoup.
The Tony win happened mainly because the 1973/74 season was a particularly weak one for new musicals:
RAISIN (847 performances) FLOP
MOLLY (68 p) FLOP
GIGI (103 p) FLOP (Based on the 1958 film)
LORELEI (320 p) FLOP (update of GENTLEMEN PREFER BLONDES)
RAINBOW JONES (1 p) FLOP
SEXTET (9 p) FLOP
OVER HERE! (341 p) FLOP
WORDS AND MUSIC (127 p) FLOP
THE MAGIC SHOW (1859 p) HIT
The revivals - with one exception - fared poorly too:
THE DESERT SONG (15 p) FLOP
THE PAJAMA GAME (65 p) FLOP
CANDIDE (740 p) FLOP (revised version)
Not a good year for musicals on Broadway.
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