I've said it here, and privately when I speak to TWG (fairly often), that in this day and age, if he wanted anything combining all of his premises to happen, it would've been as a limited series with a finite ending on one of the streamers, maybe with a song or two per episode.
As it stands, I think in the cold light of day, the more it fades from memory, the more (some, not all) people realize that they weren't truly happy with the Bat musical they got; they were just excited that anything resembling it actually happened in Jim's lifetime.
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