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A already is and D and C seem on their way out. AA and AAA will likely need an equivalent that's worth it to change over. 9v for smoke detectors is unlikely to be replaced by a battery, but I swear by mains connected smoke detectors.
Ultimately I wish these were being replaced by standardized rechargeable. Take common voltages/amperages and sizes and just make RA,RAA,RB… for simplicity. I love my rechargeable AA and AAA cells until then