That's a good question. My DJI WKM miraculously survived a bad crash. I inspected the cables, test flew it on a small quad before putting it on my new Y6. I wonder about the longevity of the product. Lipos have a life span. The battery tech gets better, but after so many charges (also depending on how you maintain the batteries) their performance will taper off. Props must be inspected for wear, cracks, fatigue etc. No one has an answer of the life expectancy for props. It probably depends on how you fly with them. Hard, fast, and heavy loads will shorten the time span that you can safely use them vs. slow and easy flying. Some cheaply built frames may suffer fatigue and stress cracks depending on load and how often you have crashes or hard landings.
Props and lipo batteries are something you can expect to have a shortened life span just like tires on a car. I've had my flight system over a year. I only wonder if the barometric sensor has a life span. Is it effected by dust or pollen?
A good brushless motor should last a long time. They will definitely last longer than the likelihood of you crAshing your craft.
