Curious why you would say this? Is it just based on the batteries themselves lasting, or is there another reason that leads you to believe rechargeables won’t last as long.
Mainly the batteries. Maybe the associated charging circuitry too? On this forum we do hear about failure modes unique to rechargeables.
Edit: In the absence of universal hearing aid chargers, not-working or lost charger could make old aids useless.
If I had to use rechargeable aids I would certainly want a set with field-replaceable batteries like Oticon, because of greater convenience and presumably smaller cost associated with battery replacement. But I wouldn’t count on suitable replacement batteries being available after some number of years. For aids needing to be sent in for battery replacement (Phonak, ReSound, maybe others), I wouldn’t count on the service being available past a certain age.