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If you are satisfied with economy no reason to do anything but maintain it. The rings wont break or fail if the engine is maintained. It won't influence longevity. No reason to prep for rebuild based on that. The things that generally kill engines are like, oil pump failure, loss of oil pressure, debris in the oil system, oil leaks which lead to low oil or dirt getting into the oil system, dropped valves, over-rev condition, broken timing chain due to age or over-rev, poor air filtration, aftermarket air filters that are poor quality, debris that gets past the air filter due to leaking intake, leaking seals, pressure leaks, stuff like that.
I think a good investment if the engine is old high mileage is a mechanical oil pressure gauge that you can see all the time easily but also in a place where it won't leak into your car. Or at least a warning light for low oil pressure besides the factory one.
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