I think like anything you need to inspect it, and keep it in good order.
Anything can and will fail/wear out.
Best to be proactive
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The real thin leather holsters are not worth their salt in my opinion. Don't buy them unless you're okay with holstering very carefully. Kydex creates a sense of false security. Many have trapped their shirts in their Kydex when reholstering and had NDs. Any holster needs to be treated with respect when reholstering. Drawing should be smooth and consistent. Reholstering should be done safely. There is no need to rapidly reholstering or do so recklessly. Just my thoughts. My leather is thick, and good ones have additional layers around the opening for rigidity.